Professor Nuttall, Trypanosoma lewisi, etc. 53 



The transmission of Trypanosoma lewisi hy fleas and lice. 

 By G. H. F. NuTTALL, Sc.D., Quick Professor of Biology. 



[Read 23 November 1908.] 



The author described experiments, conducted in the Quick 

 Laboratory, which demonstrated that Ceratophyllus fasciatus and 

 Haematopinus spinulosus are capable of transmitting Trypanosoma 

 lewisi. In one experiment, 3 fleas, transferred from a diseased to 

 a healthy rat, gave a positive result. On the other hand, 30 — 60 

 lice were required for the transmission of the trypanosome. No 

 signs of any development of the trypanosomes were observed in 

 the bodies of the lice. 



The presence of anticoagulin in the salivary glands of Argas 

 persicus. By G. H. F. Nuttall, Sc.D., Quick Professor of 

 Biology. 



[Bead 23 November 1908.] 



Experiments conducted with Mr C. Strickland have shown 

 that the salivary glands and intestine of Argas persicus contain 

 an anticoagulin which is inactivated by exposure to a temperature 

 of 80° C. for 10 minutes. The organs of the tick do not contain 

 haemolysins. 



