METAMORPHOSIS OF FILARIA BANCROFTI, COBB. 



57 



a tablespoon) made of wire and mosquito net the pupee are trans- 

 ferred to a glass vessel 1 of water such as a fish bowl (about six 

 inches in diameter at the mouth). The mouth of bowl is covered 

 with muslin the material known as "white leno" was found very 

 serviceable ; mosquito net is not suitable as mosquitoes can, when 

 they try, creep through the meshes, especially when the net is 

 stretched tightly. The pupae do not require food, and in a day or 

 two the perfect insects will have emerged from them. The male 

 mosquitoes are easily distinguished by their large feathery antennae; 

 they do not suck blood. Transference of mosquitoes to a glass 

 cell is performed by means of a " collecting tube"; this is a hollow 

 glass cylinder conveniently four inches long and one and a half 

 inches in diameter, one end is covered with mosquito net, whilst 

 a cork is loosely fitted to the other (Fig. 8); pieces of Argand 

 gas-lamp chimney make good collecting tubes. 



Glass cells, about ten inches high and six inches in diameter, 

 are convenient wherein to store living mosquitoes; they are fitted 



Fig. 7. 



Fig. 8. 



