9 6 



3. Feed some Taeniorhyncbus on Proteosoma 

 sparrows, and note the negative result. 



4. Feed some Culex upon pigeons containing 

 Halteridium, and note negative result (Fide p. 254). 



Sparrows containing H alter idium, so frequently 

 (in India) contain Proteosoma that, even if the latter 

 is not observed under the microscope, it is difficult to 

 be sure of its absence. 



