Jan. 25—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. 3—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 12—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 15—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 16—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 20—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 18—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 29—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 7—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. 10—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. 11—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. 14—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. 17—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. 20—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
batch of insects. Shall begin by investigating things like Prussian and Turnbull’s blue—iron and cyanogen salts.
Aug. 25—Batta complained of a pain in his back today—things may be developing.
Sept. 3—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. 24—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. 9—Batta is lethargic and has taken to his bed. Have been giving Gamba tryparsamide for two weeks, and fancy he’ll recover.
Oct. 25—Batta very low, but Gamba nearly well.
Nov. 18—Batta died yesterday, and a curious thing happened which gave me a real shiver in view of the native legends and Batta’s own fears. When I returned to the laboratory after the death I heard the most singular buzzing and thrashing in cage 12, which contained the fly that bit Batta. The creature seemed frantic, but stopped still when I appeared—lighting on the wire netting and looking at me in the oddest way. It reached its legs through the wires as if it were bewildered. When I came back from dining with Allen, the thing was dead. Evidently it had gone wild and beaten its life out on the sides of the cage.
It certainly is peculiar that this should happen just as Batta died. If any black had seen it, he’d have laid it at once to the absorption
of the poor devil’s soul. I shall start my blue-stained hybrids on their way before long now. The hybrid’s rate of killing seems a little ahead of the pure
palpalis’rate,
if anything. Batta died three months and eight days after infection—but of course there is always a wide margin of uncertainty. I almost wish I had let Gamba’s case run on.
Dec. 5—Busy planning how to get my envoys to Moore. I must have them appear to come from some disinterested entomologist who has read his
Diptera of Central and Southern Africa
and believes he would like to study this “new and unidentifiable species”. There must also be ample assurances that the blue-winged fly is harmless, as proved by the natives’ long experience. Moore will be off his guard, and one of the flies will surely get him sooner or later—though one can’t tell just when.
I’ll have to rely on the letters of New York friends—they still speak of Moore from time to time—to keep me informed of early results, though I dare say the papers will announce his death. Above all, I must shew no interest in his case. I shall mail the flies while on a trip, but must not be recognised when I do it. The best plan will be to take a long vacation in the interior, grow a beard, mail the package at Ukala while passing as a visiting entomologist, and return here after shaving off the beard.
April 12,1930—Back in M’gonga after my long trip. Everything has come off finely—with clockwork precision. Have sent the flies to Moore without leaving a trace. Got a Christmas vacation Dec. 15th, and set out at once with the proper stuff. Made a very good mailing container with room to include some germ-tainted crocodile meat as food for the envoys. By the end of February I had beard enough to shape into a close Vandyke.
Shewed up at Ukala March 9th and typed a letter to Moore on the trading-post machine. Signed it “Nevil Wayland-Hall”—supposed to be an entomologist from London. Think I took just the right tone—interest of a brother-scientist, and all that. Was artistically casual in emphasising the “complete harmlessness” of the specimens. Nobody suspected anything. Shaved the beard as soon as I hit the bush, so that there wouldn’t be any uneven tanning by the time I got back here. Dispensed with native bearers except for one small stretch of swamp—I can do wonders with one knapsack, and my sense of direction is good. Lucky I’m used to such travelling. Explained my protracted absence by pleading a touch of fever and some mistakes in direction when going through the bush.
But now comes the hardest part psychologically—waiting for news of Moore without shewing the strain. Of course, he may
possibly escape a bite until the venom is played out—but with his recklessness the chances are one hundred to one against him. I have no regrets; after what he did to me, he deserves this and more.
June 30, 1930—Hurrah! The first step worked! Just heard casually from Dyson of Columbia that Moore had received some new blue-winged flies from Africa, and that he is badly puzzled over them! No word of any bite—but if I know Moore’s slipshod ways as I think I do, there’ll be one before long!
August 27, 1930—Letter from Morton in Cambridge. He says Moore writes of feeling very run-down, and tells of an insect bite on the back of his neck—from a curious new specimen that he received about the middle of June. Have I succeeded? Apparently Moore doesn’t connect the bite with his weakness. If this is the real stuff, then Moore was bitten well within the insect’s period of infectivity.
Sept. 12, 1930—Victory! Another line from Dyson says that Moore is really in an alarming shape. He now traces his illness to the bite, which he received around noon on June 19, and is quite bewildered about the identity of the insect. Is trying to get in touch with the “Nevil Wayland-Hall” who sent him the shipment. Of the hundred-odd that I sent, about twenty-five seem to have reached him alive. Some escaped at the time of the bite, but several larvae have appeared from eggs laid since the time of mailing. He is, Dyson says, carefully incubating these larvae. When they mature I suppose he’ll identify the
tsetse-palpalis
hybridisation—but that won’t do him much good now. He’ll wonder, though, why the blue wings aren’t transmitted by heredity!
Nov. 8, 1930—Letters from half a dozen friends tell of Moore’s serious illness. Dyson’s came today. He says Moore is utterly at sea about the hybrids that came from the larvae and is beginning to think that the parents got their blue wings in some artificial way. Has to stay in bed most of the time now. No mention of using tryparsamide.
Feb. 13, 1931—Not so good! Moore is sinking, and seems to know no remedy, but I think he suspects me. Had a very chilly letter from Morton last month, which told nothing of Moore; and now Dyson writes—also rather constrainedly—that Moore is forming theories about the whole matter. He’s been making a search for “Wayland-Hall” by telegraph—at London, Ukala, Nairobi, Mombasa, and other places—and of course finds nothing. I judge that he’s told Dyson whom he suspects, but that Dyson doesn’t believe it yet. Fear Morton does believe it.
I see that I’d better lay plans for getting out of here and effacing my identity for good. What an end to a career that started out so well! More of Moore’s work—but this time he’s paying for it in advance! Believe I’ll go back to South Africa—and meanwhile will quietly deposit funds there to the credit of my new self—”Frederick Nasmyth Mason of Toronto, Canada, broker in mining properties”. Will establish a new signature for identification. If I never have to take the step, I can easily re-transfer the funds to my present self.