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 
larvee, it was observed that the larvee lived for some days. At the end 
of fumigation tests it was impossible to determine the viability of 
larvee 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 larve were killed with carbon disulphid within 
3 hours. In no case did larve live after subjection to 34 hours of 
carbon disulphid. These gases were liberated from absorbent cotton 
in the corner of the box, and no larve 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. 
