119 little from the cotton moth trap invented by this firm, but both Mr. King and I think they may serve the purpose of trapping tsetses, provided it is found the flies will enter them.

As regards methods of attraction, the following measures will be tried : 4 1. Soaking the central bands or wicks in a mixture of water and either human or animal sweat.

2. Placing a live animal in the trap 4 a suggestion made by Captain O'Farrell. 3. Soaking the central bands in citrated blood, and at the same time hanging up in the trap a piece of fresh meat from ox or buck with skin still adherent.

4. Soaking the bands as above and having in addition a tube of citrated blood arranged according to the ingenious device of Rodhain and his colleagues.' If desired, the blood in this tube ma)- be poisoned.

It is hoped that one or other of these measures may be effective. Lieutenant Ranken will shortly take two of these traps with him to Yei, and carry out the necessary experiments.

III. Fig. 7 is a photograph of a full-grown bull of the small black breed found in Southern Kordofan. It was kindly sent me, at my request, by Major R. S. Wilson, Governor of the Nuba Mountains Province.

This breed is said to be immune to trypanosomiasis, and is the only breed which can live in the infected Koalib area, where G. Dior sit ans abounds and conveys an infection due to what I believe is T . brucei. It is interesting to note that an apparently similar breed exists in Northern Nigeria. Pollard reports that There is in the Munshi Division, and in the northern part of the province, a small black breed of cattle which is apparently immune to tsetse. At any rate, these cattle can be kept in the Munshi district, where no horses can live and where imported Fuhlani cattle all die. I have not yet obtained any blood-films from these animals.'

The Kordofan breed may, of course, only be immune to one species of trypanosome, and, where only one specimen of these cattle is available, it does not seem desirable to make exp>eriments in this