The blank-book was not a large one, and the entries were in a fine handwriting, which, however, grew careless and nervous-looking toward the last. It consisted of a series of jottings at first rather irregularly spaced, but finally becoming daily. To call it a diary would not be quite correct, for it chronicled only one set of its writer’s activities. Dr. Van Keulen recognised the name of the dead man the moment he opened the cover, for it was that of an eminent member of his own profession who had been largely connected with African matters. In another moment he was horrified to find this name linked with a dastardly crime, officially unsolved, which had filled the newspapers some four months before. And the farther he read, the deeper grew his horror, awe, and sense of loathing and panic.
Here, in essence, is the text which the doctor read aloud in that sinister and increasingly noisome room while the three men around him breathed hard, fidgeted in their chairs, and darted frightened glances at the ceiling, the table, the thing on the floor, and one another:
JOUNRAL OF
THOMAS SLAUENWITE, M.D.
Touching punishment of Henry Sargent Moore, Ph.D., of Brooklyn, New York, Professor of Invertebrate Biology in Columbia University, New York, N.Y. Prepared to be read after my death, for the satisfaction of making public the accomplishment of my revenge, which may otherwise never be imputed to me even if it succeeds.
January 5th, 1929—I have now fully resolved to kill Dr. Henry Moore, and a recent incident has shewn me how I shall do it. From now on, I shall follow a consistent line of action; hence the beginning of this journal.
It is hardly necessary to repeat the circumstances which have driven me to this course, for the informed part of the public is familiar with all the salient facts. I was born in Trenton, New Jersey, on April 12th, 1885, the son of Dr. Paul Slauenwite, formerly of Pretoria, Transvaal, South Africa. Studying medicine as part of my family tradition, I was led by my father (who died in 1916, while I was serving in France in a South African regiment) to specialise in African fevers; and after my graduation from Columbia spent much time in researches which took me from Durban, in Natal, up to the equator itself.
In Mombasa I worked out my new theory of the transmission and development of remittent fever, aided only slightly by the papers of the late government physician, Sir Norman Sloane, which I found in the house I occupied. When I published my results I became at a single stroke a famous authority. I was told of the probability of an almost supreme position in the South African health service, and even a probable knighthood, in the event of my becoming a naturalised citizen, and accordingly I took the necessary steps.
Then occurred the incident for which I am about to kill Henry Moore. This man, my classmate and friend of years in America and Africa, chose deliberately to undermine my claim to my own theory; alleging that Sir Norman Sloane had anticipated me in every essential detail, and implying that I had probably found more of his papers than I had stated in my account of the matter. To buttress this absurd accusation he produced certain personal letters from Sir Norman which indeed shewed that the older man had been over my ground, and that he would have published his results very soon but for his sudden death. This much I could only admit with regret. What I could not excuse was the jealous suspicion that I had stolen the theory from Sir Norman’s papers. The British government, sensibly enough, ignored these aspersions, but withheld the half-promised appointment and knighthood on the ground that my theory, while original with me, was not in fact new.
I could soon see that my career in Africa was perceptibly checked; though I had placed all my hopes on such a career, even to the point of resigning American citizenship. A distinct coolness toward me had arisen among the Government set in Mombasa, especially among those who had known Sir Norman. It was then that I resolved to be even with Moore sooner or later, though I did not know how. He had been jealous of my early celebrity, and had taken advantage of his old correspondence with Sir Norman to ruin me. This from the friend whom I had myself led to take an interest in Africa—whom I had coached and inspired till he achieved his present moderate fame as an authority on African entomology. Even now, though, I will not deny that his attainments are profound. I made him, and in return he has ruined me. Now—some day—I shall destroy him.
When I saw myself losing ground in Mombasa, I applied for my present situation in the interior—at M’gonga, only fifty miles from the Uganda line. It is a cotton and ivory trading-post, with only eight white men besides myself. A beastly hole, almost on the equator, and full of every sort of fever known to mankind. Poisonous snakes and insects everywhere, and niggers with diseases nobody ever heard of outside medical college. But my work is not hard, and I have always had plenty of time to plan things to do to Henry Moore. It amuses me to give his Diptera of Central and Southern Africa a prominent place on my shelf. I suppose it actually is a standard manual—they use it at Columbia, Harvard, and the U. of Wis.—but my own suggestions are really responsible for half its strong points.
Last week I encountered the thing which decided me how to kill Moore. A party from Uganda brought in a black with a queer illness which I can’t yet diagnose. He was lethargic, with a very low temperature, and shuffled in a peculiar way. Most of the others were afraid of him and said he was under some kind of witch-doctor spell; but Gobo, the interpreter, said he had been bitten by an insect. What it was, I can’t imagine—for there is only a slight puncture on the arm. It is bright red, though, with a purple ring around it. Spectral-looking—I don’t wonder the boys lay it to black magic. They seem to have seen cases like it before, and say there’s really nothing to do about it.
Old N’Kuru, one of the Galla boys at the post, says it must be the bite of a devil-fly, which makes its victim waste away gradually and die, and then takes hold of his soul and personality if it is still alive itself—flying around with all his likes, dislikes, and consciousness. A queer legend—and I don’t know of any local insect deadly enough to account for it. I gave this sick black—his name is Mevana—a good shot of quinine and took a sample of his blood for testing, but haven’t made much progress. There is certainly a strange germ present, but I can’t even remotely identify it. The nearest thing to it is the bacillus one finds in oxen, horses, and dogs that the tsetse-fly has bitten; but tsetse-flies don’t infect human beings, and this is too far north for them anyway.
However—the important thing is that I’ve decided how to kill Moore. If this interior region has insects as poisonous as the natives say, I’ll see that he gets a shipment of them from a source he won’t suspect, and with plenty of assurances that they are harmless. Trust him to throw overboard all caution when it comes to studying an unknown species—and then we’ll see how Nature takes its course! It ought not to be hard to find an insect that scares the blacks so much. First to see how poor Mevana turns out—and then to find my envoy of death.
Jan. 7th—Mevana is no better, though I have injected all the antitoxins I know of. He has fits of trembling, in which he rants affrightedly about the way his soul will pass when he dies into the insect that bit him, but between them he remains in a kind of half-stupor. Heart action still strong, so I may pull him through. I shall try to, for he can probably guide me better than anyone else to the region where he was bitten.
Meanwhile I’ll write to Dr. Lincoln, my predecessor here, for Allen, the head factor, says he had a profound knowledge of the local sicknesses. He ought to know about the death-fly if any white man does. He’s at Nairobi now, and a black runner ought to get me a reply in a week—using the railway for half the trip.
Jan. 10th—Patient unchanged, but I have found what I want! It was in an old volume of the local health records, which I’ve been going over diligently while waiting to hear from Lincoln. Thirty years ago there was an epidemic that killed off thousands of natives in Uganda, and it was definitely traced to a rare fly called Glossina palpalis—a sort of cousin of the Glossina marsitans or tsetse. It lives in the bushes on the shores of lakes and rivers, and feeds
on the blood of crocodiles, antelopes, and large mammals. When these food animals have the germ of trypanosomiasis, or sleeping-sickness, it picks it up and develops acute infectivity after an incubation period of thirty-one days. Then for seventy-five days it is sure death to anyone or anything it bites.
Without doubt, this must be the ‘devil-fly’ the niggers talk about. Now I know what I’m heading for. Hope Mevana pulls through. Ought to hear from Lincoln in four or five days—he has a great reputation for success in things like this. My worst problem will be to get the flies to Moore without his recognising them. With his cursed plodding scholarship it would be just like him to know all about them since they’re actually on record.
Jan. 15th—Just heard from Lincoln, who confirms all that the records say about Glossina palpalis. He has a remedy for sleeping-sickness which has succeeded in a great number of cases when not given too late. Intermuscular injections of tryparsamide. Since Mevana was bitten about two months ago, I don’t know how it will work—but Lincoln says that cases have been known to drag on eighteen months, so possibly I’m not too late. Lincoln sent over some of his stuff, so I’ve just given Mevana a stiff shot. In a stupor now. They’ve brought his principal wife from the village, but he doesn’t even recognise her. If he recovers, he can certainly shew me where the flies are. He’s a great crocodile hunter, according to report, and knows all Uganda like a book. I’ll give him another shot tomorrow.
Jan. 16th—Mevana seems a little brighter today, but his heart action is slowing up a bit. I’ll keep up the injections, but not overdo them.
Jan. 17th—Recovery really pronounced today. Mevana opened his eyes and shewed signs of actual consciousness, though dazed, after the injection. Hope Moore doesn’t know about tryparsamide. There’s a good chance he won’t, since he never leaned much toward medicine. Mevana’s tongue seemed paralysed, but I fancy that will pass off if I can only wake him up. Wouldn’t mind a good sleep myself, but not of this kind!
Jan. 25th—Mevana nearly cured! In another week I can let him take me into the jungle. He was frightened when he first came to—about having the fly take his personality after he died—but brightened up finally when I told him he was going to get well. His wife, Ugowe, takes good care of him now, and I can rest a bit. Then for the envoys of death!
Feb. 3rd—Mevana is well now, and I have talked with him about a hunt for flies. He dreads to go near the place where they got him, but I am playing on his gratitude. Besides, he has an idea that I can ward off disease as well as cure it. His pluck would shame a white man—there’s no doubt that he’ll go. I can get off by telling the head factor the trip is in the interest of local health work.
March 12th—In Uganda at last! Have five boys besides Mevana, but they are all Gallas. The local blacks couldn’t be hired to come near the region after the talk of what had happened to Mevana. This jungle is a pestilential place—steaming with miasmal vapours. All the lakes look stagnant. In one spot we came upon a trace of Cyclopean ruins which made even the Gallas run past in a wide circle. They say these megaliths are older than man, and that they used to be a haunt or outpost of ‘The Fishers from Outside’—whatever that means—and of the evil gods Tsadogwa and Clulu. To this day they are said to have a malign influence, and to be connected somehow with the devil-flies.
March 15th—Struck Lake Mlolo this morning—where Mevana was bitten. A hellish, green-scummed affair, full of crocodiles. Mevana has fixed up a fly-trap of fine wire netting baited with crocodile meat. It has a small entrance, and once the quarry get in, they don’t know enough to get out. As stupid as they are deadly, and ravenous for fresh meat or a bowl of blood. Hope we can get a good supply. I’ve decided that I must experiment with them—finding a way to change their appearance so that Moore won’t recognise them. Possibly I can cross them with some other species, producing a strange hybrid whose infection-carrying capacity will be undiminished. We’ll see. I must wait, but am in no hurry now. When I get ready I’ll have Mevana get me some infected meat to feed my envoys of death—and then for the post-office. Ought to be no trouble getting infection, for this country is a veritable pest-hole.
March 16th—Good luck. Two cages full. Five vigorous specimens with wings glistening like diamonds. Mevana is emptying them into a large can with a tightly meshed top, and I think we caught them in the nick of time. We can get them to M’gonga without trouble. Taking plenty of crocodile meat for their food. Undoubtedly all or most of it is infected.
April 20th—Back at M’gonga and busy in the laboratory. Have sent to Dr. Joost in Pretoria for some tsetse-flies for hybridisation experiments. Such a crossing, if it will work at all, ought to produce something pretty hard to recognise yet at the same time just as deadly as the palpalis. If this doesn’t work, I shall try certain other diptera from the interior, and I have sent to Dr. Vandervelde at Nyangwe for some of the Congo types. I shan’t have to send Mevana for more tainted meat after all; for I find I can keep cultures of the germ Trypanosoma gambiense, taken from the meat we got last month, almost indefinitely in tubes. When the time comes, I’ll taint some fresh meat and feed my winged envoys a good dose—then bon voyage to them!
June 18th—My tsetse-flies from Joost came today. Cages for breeding were all ready long ago, and I am now making selections. Intend to use ultra-violet rays to speed up the life-cycle. Fortunately I have the needed apparatus in my regular equipment. Naturally I tell no one what I’m doing. The ignorance of the few men here makes it easy for me to conceal my aims and pretend to be merely studying existing species for medical reasons.
June 29th—The crossing is fertile! Good deposits of eggs last Wednesday, and now I have some excellent larvae. If the mature insects look as strange as these do, I need do nothing more. Am preparing separate numbered cages for the different specimens.
July 7th—New hybrids are out! Disguise is excellent as to shape, but sheen of wings still suggests palpalis. Thorax has faint suggestions of the stripes of the tsetse. Slight variation in individuals. Am feeding them all on tainted crocodile meat, and after infectivity develops will try them on some of the blacks—apparently, of course, by accident. There are so many mildly venomous flies around here that it can easily be done without exciting suspicion. I shall loose an insect in my tightly screened dining-room when Batta, my house-boy, brings in breakfast—keeping well on guard myself. When it has done its work I’ll capture or swat it—an easy thing because of its stupidity—or asphyxiate it by filling the room with chlorine gas. If it doesn’t work the first time, I’ll try again until it does. Of course, I’ll have the tryparsamide handy in case I get bitten myself—but I shall be careful to avoid biting, for no antidote is really certain.
Aug. 10th—Infectivity mature, and managed to get Batta stung in fine shape. Caught the fly on him, returning it to its cage. Eased up the pain with iodine, and the poor devil is quite grateful for the service. Shall try a variant specimen on Gamba, the factor’s messenger, tomorrow. That will be all the tests I shall dare to make here, but if I need more I shall take some specimens to Ukala and get additional data.
Aug. 11th—Failed to get Gamba, but recaptured the fly alive. Batta still seems as well as usual, and has no pain in the back where he was stung. Shall wait before trying to get Gamba again.
Aug. 14th—Shipment of insects from Vandervelde at last. Fully seven distinct species, some more or less poisonous. Am keeping them well fed in case the tsetse crossing doesn’t work. Some of these fellows look very unlike the palpalis, but the trouble is that they may not make a fertile cross with it.
Aug. 17th—Got Gamba this afternoon, but had to kill the fly on him. It nipped him in the left shoulder. I dressed the bite, and Gamba is as grateful as Batta was. No change in Batta.
Aug. 20th—Gamba unchanged so far—Batta too. Am experimenting with a new form of disguise to supplement the hybridisation—some sort of dye to change the telltale glitter of the palpalis’ wings. A bluish tint would be best—something I could spray on a whole batc
h of insects. Shall begin by investigating things like Prussian and Turnbull’s blue—iron and cyanogen salts.
Aug. 25th—Batta complained of a pain in his back today—things may be developing.
Sept. 3rd—Have made fair progress in my experiments. Batta shews signs of lethargy, and says his back aches all the time. Gamba beginning to feel uneasy in his bitten shoulder.
Sept. 24th—Batta worse and worse, and beginning to get frightened about his bite. Thinks it must be a devil-fly, and entreated me to kill it—for he saw me cage it—until I pretended to him that it had died long ago. Said he didn’t want his soul to pass into it upon his death. I give him shots of plain water with a hypodermic to keep his morale up. Evidently the fly retains all the properties of the palpalis. Gamba down, too, and repeating all of Batta’s symptoms. I may decide to give him a chance with tryparsamide, for the effect of the fly is proved well enough. I shall let Batta go on, however, for I want a rough idea of how long it takes to finish a case.
Dye experiments coming along finely. An isomeric form of ferrous ferrocyanide, with some admixture of potassium salts, can be dissolved in alcohol and sprayed on the insects with splendid effect. It stains the wings blue without affecting the dark thorax much, and doesn’t wear off when I sprinkle the specimens with water. With this disguise, I think I can use the present tsetse hybrids and avoid bothering with any more experiments. Sharp as he is, Moore couldn’t recognise a blue-winged fly with a half-tsetse thorax. Of course, I keep all this dye business strictly under cover. Nothing must ever connect me with the blue flies later on.
Oct. 9th—Batta is lethargic and has taken to his bed. Have been giving Gamba tryparsamide for two weeks, and fancy he’ll recover.
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