GASTROPHILUS HAEMORRHOIDALIS AND OTHER BOTS. 39 



moistened. The sections came from both the stomach, and duodenum, 

 and the tests include all three species of Gastrophilus. After the 

 short periods of fumigation, which were ineffective with last-stage 

 larvae, it was observed that the larvae lived for some days. At the end 

 of fumigation tests it was impossible to determine the viability of 

 larvae except by observing them for a number of days. As will be 

 seen in Table IX, chloroform was not wholly effective at 4 hours, 

 but at a later date larvae were killed with carbon disulphid within 

 3 hours. In no case did larvae live after subjection to 3 J hours of 

 carbon disulphid. These gases were liberated from absorbent cotton 

 in the corner of the box, and no larvae came in direct contact with the 

 liquid, as would probably be the case within the stomach. The carbon 

 disulphid, being soluble in water, evidently reaches all portions of 

 the stomach, either as a gas or in solution. 



