948 MICROBIAL DISEASES OF INSECTS 



toward the bacteria used in producing this immunity. The extent of 

 immunity studies possible with insects seems to be limited by the fact 

 that the insects, grasshoppers, and caterpillars, do not seem to be able 

 to overcome the effects of a second injection. 



The agglutination reaction has been successfully applied by Aoki 

 and Chigasaki in the examination of silkworms for differentiating B. 

 sotto from B. megaterium and B. alvei which it resembles, as this re- 

 action is strongly specific for the former. Aoki has also worked with 

 the precipitation reaction using silk worm caterpillar immune serum. 



