97 
light, temperature, and bacterial growth. They rarely show 
any tendency to leave the shells. When placed in tap water 
the majority of the embryos are found to be free in twenty- 
four hours. ; 
These larvae were found to resemble the sixth larval stage of 
H. muscae, as described by Ransom. As many as eight larvae 
were found in the head and proboscis of one fly. — 
In the later experiments the examination of flies that had 
to eighteen à : : 
_ Flies bred in sterilized horse-dung, with which had been 
mixed an emulsion of embryos in normal saline solution, 
- . 2 i ; . 50 
<T mm. The maximum width was found to vary from 9" P 
to 66°6 u. The head was rounded and the body tapered slightly 
INST | 
