MALARIA EXPEDITIONS 



259 



containing halteridium, immature proteosoma, etc., 

 not one contained a single pigmented cell." Another 

 time (April 1898) he counted these pigment-cells 

 under the microscope : — 



" Ten mosquitoes fed on the sparrow with 

 numerous proteosoma contained 1009 pigmented 

 cells, or an average of 101 each. Ten mosquitoes 

 fed on the sparrow with moderate proteosoma con- 

 tained 292 pigmented cells, or an average of 29 

 each. The mosquitoes fed on the sparrow with no 

 proteosoma contained no pigmented cells." 



Finally, he completed the circle of development 

 by infecting healthy sparrows by causing mosquitoes 

 to bite them. 



In 1899, there went out a German Commission 

 to German East Africa, a Royal Society's Com- 

 mission to British Central Africa, and an expedi- 

 tion from the Liverpool School of Tropical 

 Medicine; in 1900, another German Commission, 

 this time to the East Indies, and another expedition 

 from the Liverpool School; by July 1901, the 

 Liverpool School was organising its seventh expedi- 

 tion. Italy, of course, has given infinite study to 

 the disease : — 



"It has been decided that, in addition to 

 the stations of observation and experiment in 

 the provinces of Rome, Milan, Cremona, Mantua, 

 Gercara, Foggia, Lecce, others shall be established 

 in the provinces of Udine, Verona, Vicenza, Padua, 

 Ravenna, Pisa, Basilicata, and Syracuse. Besides 

 epidemiological researches, applications on a large 



