But soon after our arrival at Rosako it was found that the dog, whose name was "Omar," given him from his Turkish origin, was missing; he had strayed away from the soldiers during a rain-squall and had got lost. I despatched Mabruki Burton back to Kikoka to search for him. On the following morning, just as we were about to leave Rosako, the faithful fellow returned with the lost dog, having found him at Kikoka.
Previous to our departure on the morning after this, Maganga, chief of the fourth caravan, brought me the unhappy report that three of his pagazis were sick, and he would like to have some "dowa"—medicine. Though not a doctor, or in any way connected with the profession, I had a well-supplied medicine chest—without which no traveller in Africa could live—for just such a contingency as was now present. On visiting Maganga's sick men, I found one suffering from inflammation of the lungs, another from the mukunguru (African intermittent). They all imagined themselves about to die, and called loudly for "Mama!" "Mama!" though they were all grown men. It was evident that the fourth caravan could not stir that day, so leaving word with Magauga to hurry after me as soon as possible, I issued orders for the march of my own.
Excepting in the neighbourhood of the villages which we have passed there were no traces of cultivation. The country extending between the several stations is as much a wilderness as the desert of Sahara, though it possesses a far more pleasing aspect. Indeed, had the first man at the time of the Creation gazed at his world and perceived it of the beauty which belongs to this part of Africa, he would have had no cause of complaint. In the deep thickets, set like islets amid a sea of grassy verdure, he would have found shelter from the noonday heat, and a safe retirement for himself and spouse during the awesome darkness. In the morning he could have walked forth on the sloping sward, enjoyed its freshness, and performed his ablutions in one of the many small streams flowing at its foot. His garden of fruit-trees is all that is required; the noble forests, deep and cool, are round about him, and in their shade walk as many animals as one can desire. For days and days let a man walk in any direction, north, south, east, and west, and he will behold the same scene.
Earnestly as I wished to hurry on to Unyanyembe, still a heart-felt anxiety about the arrival of my goods carried by the fourth caravan, served as a drag upon me and before my caravan had marched nine miles my anxiety had risen to the highest pitch, and caused me to order a camp there and then. The place selected for it was near a long straggling sluice, having an abundance of water during the rainy season, draining as it does two extensive slopes. No sooner had we pitched our camp, built a boma of thorny acacia, and other tree branches, by stacking them round our camp, and driven our animals to grass; than we were made aware of the formidable number and variety of the insect tribe, which for a time was another source of anxiety, until a diligent examination of the several species dispelled it.
As it was a most interesting hunt which I instituted for the several specimens of the insects, I here append the record of it for what it is worth. My object in obtaining these specimens was to determine whether the genus Glossina morsitans of the naturalist, or the tsetse (sometimes called setse) of Livingstone, Vardon, and Gumming, said to be deadly to horses, was amongst them. Up to this date I had been nearly two months in East Africa, and had as yet seen no tsetse; and my horses, instead of becoming emaciated—for such is one of the symptoms of a tsetse bite—had considerably improved in condition. There were three different species of flies which sought shelter in my tent, which, unitedly, kept up a continual chorus of sounds—one performed the basso profondo, another a tenor, and the third a weak contralto. The first emanated from a voracious and fierce fly, an inch long, having a ventral capacity for blood quite astonishing.
This larger fly was the one chosen for the first inspection, which was of the intensest. I permitted one to alight on my flannel pyjamas, which I wore while en deshabille in camp. No sooner had he alighted than his posterior was raised, his head lowered, and his weapons, consisting of four hair-like styles, unsheathed from the proboscis-like bag which concealed them, and immediately I felt pain like that caused by a dexterous lancet-cut or the probe of a fine needle. I permitted him to gorge himself, though my patience and naturalistic interest were sorely tried. I saw his abdominal parts distend with the plenitude of the repast until it had swollen to three times its former shrunken girth, when he flew away of his own accord laden with blood. On rolling up my flannel pyjamas to see the fountain whence the fly had drawn the fluid, I discovered it to be a little above the left knee, by a crimson bead resting over the incision. After wiping the blood the wound was similar to that caused by a deep thrust of a fine needle, but all pain had vanished with the departure of the fly.
Having caught a specimen of this fly, I next proceeded to institute a comparison between it and the tsetse, as described by Dr. Livingstone on pp. 56–57, 'Missionary Travels and Researches in South Africa' (Murray's edition of 1868). The points of disagreement are many, and such as to make it entirely improbable that this fly is the true tsetse, though my men unanimously stated that its bite was fatal to horses as well as to donkeys. A descriptive abstract of the tsetse would read thus: "Not much larger than a common house-fly, nearly of the same brown colour as the honey-bee. After-part of the body has yellow bars across it. It has a peculiar buzz, and its bite is death to the horse, ox, and dog. On man the bite has no effect, neither has it on wild animals. When allowed to feed on the hand, it inserts the middle prong of three portions into which the proboscis divides, it then draws the prong out a little way, and it assumes a crimson colour as the mandibles come into brisk operation; a slight itching irritation follows the bite."
The fly which I had under inspection is called mabunga by the natives. It is much larger than the common housefly, fully a third larger than the common honey-bee, and its colour more distinctly marked; its head is black, with a greenish gloss to it; the after-part of the body is marked by a white line running lengthwise from its junction with the trunk, and on each side of this white line are two other lines, one of a crimson colour, the other of a light brown. As for its buzz, there is no peculiarity in it, it might be mistaken for that of a honey-bee. When caught it made desperate efforts to get away, but never attempted to bite. This fly, along with a score of others, attacked my grey horse, and bit it so sorely in the legs that they appeared as if bathed in blood. Hence, I might have been a little vengeful if, with more than the zeal of an entomologist, I caused it to disclose whatever peculiarities its biting parts possessed.
In order to bring this fly as life-like as possible before my readers, I may compare its head to most tiny miniature of an elephant's, because it has a black proboscis and a pair of horny antennae, which in colour and curve resemble tusks. The black proboscis, however, the simply a hollow sheath, which encloses, when not in the act of biting, four reddish and sharp lancets. Under the microscope these four lancets differ in thickness, two are very thick, the third is slender, but the fourth, of an opal colour and almost transparent, is exceedingly fine. This last must be the sucker. When the fly is about to wound, the two horny antennae are made to embrace the part, the lancets are unsheathed, and on the instant the incision is performed. This I consider to be the African "horse-fly."
The second fly, which sang the tenor notes more nearly resembled in size and description the tsetse. It was exceedingly nimble, and it occupied three soldiers nearly an hour to capture a specimen; and, when it was finally caught, it stung most ravenously the hand, and never ceased its efforts to attack until it was pinned through. It had three or four white marks across the after-part of its body; but the biting parts of this fly consisted of two black antennae and an opal coloured style, which folded away under the neck. When about to bite, this style was shot out straight, and the antennae embraced it closely. After death the fly lost its distinctive white marks. Only one of this species did we see at this camp. The third fly, called "chufwa," pitched a weak alto-crescendo note, was a third larger than the house fly, and had long wings. If this insect sang the feeblest note, it certainly did the most work, and inflicted the most injury. Horses and donkeys streamed with blood, and reared and kicked through the pain. So determined was it not to be driven before it obtained its fill, that it was easily despatched;