No. 506] 



NOTES AND LITERATURE 



oughly demonstrated through laboratory experiments. A second 

 paper deals with the medical results of segregation camps and 

 of chemical therapy in Uganda. 



In the Huxley lecture, delivered at Charing Cross Hospital. 

 October 1, 1908, Sir Patrick Manson, speaking on "Recent 

 Advances in Science and their Bearing on Medicine and Sur- 

 gery," discussed some points of great interest to biologists. At 

 the start he noted the propriety of this theme for a Huxley 

 lecture since the successful study of tropical diseases both de- 

 pends on the use of those methods so consistently and powerfully 

 employed by that great master of natural science, and also deals 

 primarily with animal organisms, protozoa and helminthes, as 

 disease producers and their special vectors, commonly arthropods, 

 while bacteriology is relocated to a secondary place. In the 

 study or teaching of tropical medicine this fact must be recog- 

 nized by the addition to each staff of a protozoologist. a helmin- 

 thologist, and an arthropodologist with suitable library and 

 laboratory facilities. After presenting a synoptic table which 

 outlines the principal tropical diseases with their causal and 

 intermediary agents, the lecturer proceeds to discuss the ap- 

 propriateness and value of biological theories in scientific ad- 

 vance with special reference to this field. Certain blood- 

 inhabiting protozoa require a second host as a medium for a 

 sexual cycle, as for instance the malarial Plasmodium makes 

 use of the mosquito. Is this to be regarded as a general law 

 applicable to all such protozoa ? The answer to this ., nest inn 



of intense interest to the biologist. The case of the sleeping 

 sickness trypanosome will serve as an example for testing the 



The chief argument in favor of such a law is to be found in 

 analogy, and though it must be used with caution the evidence 



