ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 155 



Trypanosoma brucei.* — Sir David Bruce, A. E. Harnerton, I). P. 

 Watson and Lady Bruce have studied a Zululand strain (1918) of 

 Trypanosome, and find that it is the same species as that discovered by 

 Bruce in Zululand in LS94, reported on by Kanthack, Durham, and 

 Blandford in 1898, and named T. brucei by Plimmer and Bradford in 

 1899. In its structural characters this trypanosome is absolutely identical 

 with the one causing disease in man in Nyasaland, T. rhodesiense of 

 Stephens and Fautham. 



The authors go onf to show that the pathogenic action of T. brucei, 

 Zululand strain (1913) on various animals is so similar, not only in 

 regard to the symptoms during life, but also in the post-mortem appear- 

 ances and rate of mortality to that of the trypanosome causing disease in 

 man in Nyasaland, that it affords another proof that these two trypano- 

 somes are identical. 



A third study $ dealing with the trypanosome causing disease in man 

 in Nyasaland, has shown that this belongs to the same group as 

 T. gambiense, the development taking place in the alimentary tract and 

 salivary glands, not in the proboscis, of the fly. The percentage of flies 

 which become infected is the same as in T. gambiense, 8 p.c. The 

 percentage of flies which become infective is about 1 p.c. The length 

 of time which elapses before a fly becomes infected varies from 14 to 

 31 days, average 23 days. The infective type of trypanosomes in the 

 salivary glands — corresponding to the final stage of the cycle of develop- 

 ment — is similar to the short stumpy form found in the blood of the 

 vertebrate host. 



In a fourth paper § the authors state their conclusion that T. brucei, 

 Zululand, 1913, belongs to the same group as T. gambiense as regards its 

 cycle of development in the tsetse fly. The trypanosome causing disease 

 in man in Nyasaland also belongs to the same group. The cycle of 

 development of the Nyasaland and Zululand trypanosomes in Glossina 

 morsitans is so marvellously alike that it affords another reason for 

 believing in the identity of these two trypanosomes. 



Sarcocystis muris.|| — Rh. Erdmann discusses some disputed points 

 concerning the life-history of this Sarcosporidian. There are two 

 sharply separated stages. The first period extends from the feeding 

 with adult Sarcosporidia to the first stage in the musculature. It lasts 

 for 28 to 30 days, and it is passed in the walls of the food-canal, in the 

 lymphatics, and in the fatty tissue of the host. The second period 

 includes the differentiation of the unicellular parasites within Miescher's 

 corpuscles which contain numerous adult Sarcosporidia. This period is 

 passed in the musculature only. 



Dicystid Gregarines of PolychBetes.f — M. Caullery and F. Mesnil 

 discuss Polgrhabdina spionis (Kolliker) found in Scolel&pis fuliginosa in 



* Proc. Roy. Soc, Series B, lxxxvii. (1914) pp. 493-510 (3 pis.). 



t Proc. Roy. Soc, Series B, lxxxvii. (1914) pp. 511-16. 



% Proc. Roy. Soc, Series B, lxxxvii. (1914) pp. 516-25 (1 pi.). 



§ Proc. Roy. Soc, Series B, lxxxvii. (1914) pp. 526-31 (1 pi.). 



|| Arch. Zool. Exper., liii. (1914) pp. 579-96 (2 pis.). 



«f C.R. Soc Biol. Paris, lxxvii. (1914) pp. 516-20 (10 figs.). 



M 2 



