120 direction. On the other hand, it will be interesting to note the effect of the blood serum of this bull on various trypanosome strains. Some work along this line has been commenced, and will be continued as circumstances permit. At present it is too early to make any statement regarding it.

I am indebted to Mr. G. Hunt, of the Engineering School of the Gordon College, for kindly plotting the curves for me. The photographs are the work of Mr. George Buchanan.

REFERENCES 1. Archibai-D. R. G. (1912). A Trypanosome of Cattle in the Southern Sudan. Journal of Comparative Pathology and Therapeutics, XXV, 4, pp. 292-297.

2. Laveran, a. & Mesvil. F. (1912). Trypanosomes et Trypanosomiases. znd edition. Masson, Paris.

3. KiNGHORN. A. & YoRKE, W. (1912). Trypanosomes Infecting Game and Domestic Stock in the Luangwa Valley, North Eastern Rhodesia. Annals of Tropical Medicine and Parasitology, VI, pp. 301-323.

4. KiNGHORN A. & YoRKE, W. (1912). Further Observations on the Trypanosomes of Game and Domestic Stock in North Eastern Rhodesia. Annals of Tropical Medicine and Parasitology, VI, pp. 483-493.

5. Duke, H. L. (1912). The transmission of Trypanosoma nanum, Laveran, and Some observations on 'Trypanosoma pecorum, Bruce, and T. uniforme, Bruce. Proceedings of the Royal Society, LXXXV, pp. 4-9 and 554-561.

6. Balfour, A. (1912). Notes on Sleeping Sickness. British Medical Journal. II, pp. lo-ii.

7. RoDH.\iN, J., Pons, C, VANDENBRANDE>f, J., & Bequaert, J. (1912). Contribution au Mecanisme de la Transmission des Trypanosomes par les Glossines. Arch. f. SchifTs.

u. Trop. Hyg., Nov., XVI, 21, pp. 732-739-8. Pollard, J. (1912). Notes on the Tsetse Flies of Muri Province, Northern Nigeria-Bulletin of Entomological Research, III, 2, pp. 219-221.