95 



as from contaminated water. On breeding experiments with Gysticerus tenui- 

 collis Bud., from sheep and their development into mature Taenia marginata 

 Batsch in the Shout African Jackal (Canis mesomelas Schrb.) The experiments 

 were made to identify cysticeri found in South African Sheep. Taenia mar- 

 ginata, Batsch occurs normally in the South African Jackal Gysticerus tenui- 

 collis has also been found in Duiker buck (Cephalophus grimmi L.). 



Dr. The il er. »Further Transmission Experiments with East Coast 

 Fever.« Hitherto the author had found that BMpieephalus decoloratus Koch 

 — the common blue tick — and Rh. evertsi Neumann — the red tick — were 

 not hosts of Piroplasma parvum Theiler, and that Rh. appendicidatus Neu- 

 mann — the brown tick — and Rh. si/mus Koch were hosts of this piro- 

 plasm; further that Amblyomma hebraeum Koch, being a tick which requires 

 three hosts, may also be a host of P. parvum. It had not been found in any 

 instance that P. parvum passed though the egg in any of these ticks, but only 

 from infected larvae to nymphae, and from nymphae to adults. Subsequently 

 Mr. Lounsbury, Entomologist of Cape Colony, stated that besides the ticks 

 mentioned Rh. nitens Neumann, Rli. evertsi Neumann, Rh. capensis Neumann 

 act as hosts of P. parvum, also in their larval-nymphal, and nymphal-aldult 

 stages. Contrary to these statements is the one made by Koch who reported 

 that Rh. decoloratus also acts as host of P. parvum, and that the infection 

 passes through the egg. Luhe considered that in the writer's experiments 

 the larvae of infected females were utilised too soon after they had hatched, 

 and that the deductions were not conclusive. Accordingly the w r riter repeated 

 the experiments, taking into consideration the statements of Koch and Luhe, 

 and the conclusions are that Rhvpicephalns appendicidatus is the principal 

 host of P. parvum, the infection being carried by nymphae and aldults. In 

 no instance did the infection pass trough the egg, as larvae of infected fema- 

 les had been tested on a large number of animals without causing East Coast 

 Fever to appear. These larval ticks had moulted up to 105 days previous to 

 infestation. Therefore the objections of Luhe no longer hold good. Neither 

 did the further progeny of infected female Rh. appendicidatus ticks, namely 

 nymphae and adults, transmit the disease. The writer also succeeded in 

 Transmitting East Coast Fever with Rh. evertsi and capensis. He failed, how- 

 ever with larvae, the progeny of infected females of Amblyomma hebraeum, 

 and with adults collected as nymphae of sick cattle, to transmit the disease. 

 He also failed to transmit East Coast Fever with the progeny of infected Rh. 

 decoloratus larvae, and since the brown ticks collected from the same tick 

 cattle produced the disease in every instance when infested on susceptible 

 animals, it must be concluded that the blue tick does not transmit the disease. 



4. Darwin-Feier in Cambridge. 



Wie aus Cambridge mitgeteilt wird, soll dort am 22., 23. und 

 24. Juni 1909 eine Feier für Charles Darwin zur 100. Wiederkehr 

 seines Geburtstages (12. Februar 1809) und der 50. Jährung der Heraus- 

 gabe seiner »Entstehung der Arten« stattfinden. Näheres darüber wird 

 noch bekannt gegeben werden. 



