Supposing the poison to be alkaline, is it not possible that the creic--an acid known to be present in the blood of all wild animals and to disappear as they become domesticated--may act as an antidote, more especially as man, on whom the poison is innocuous, shares with the donkey, &c., this prophylactic acid? This pest, like all others, is held in check by an antagonist, one of the ichneumons--a rakish-looking creature which catches and sucks it out on the wing, dropping the empty cases much as the locust bird does the locusts. These tsétsé have caused me sad searchings of heart. The Geographical Society of Paris honoured me with their medal, ‘pour la découverte du lac ’Ngami,’ and I, in acknowledging their highly valued distinction, sent them a short sketch of the country through which we had passed, and a small bottle of the flies, with an account of their habits, habitat, and the poisonous nature of their bite. This account--probably from my confused style--was entirely misunderstood, and when the copy of the Proceedings of the Society reached me I found I had been made to attribute the death of a native chief, Sebitoani, to the poison of these insects, and also to state that the oxen were maddened by their attacks, whereas the poor things took their deathbites quite calmly--with a whisk of their tails, as is their custom with other flies--and, as I have already stated, human beings suffer no ill. I have tried to correct this impression, but fear I may not have succeeded.