594 THE AMEBIC AN NATURALIST [Vol.XLVI 



tition of 10 X 12 glass. The top is made of screen wire; 

 the bottom of £ inch wire mesh (hardware cloth). 



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From a sanitary point of view too much emphasis can 

 hardly be placed upon the construction of the bottom. 

 By using J inch wire mesh through which waste material 

 will readily fall, I have succeeded in providing a case 

 which in a large measure is self cleaning. The cases thus 

 constructed are placed on a long trough-like table, cov- 



