FUMIGATION WITH CARBON BISULPHID 277 
phid. Frequently the holds of ships are cleared of pests 
in this manner. ‘The liquid is quite generally used for 
the destruction of a number of insects commonly called 
museum pests. When specimens are inclosed in fairly 
tight showcases or trays, they can be easily treated in 
the cabinet or drawer. As a measure of safety, in 
many museums the fumigation is done annually, 
regardless of the absence or presence of the pests. 
Killing pratrie-dogs, gophers, squirrels, etc.—¥For 
the destruction of small animals that burrow under 
ground, such as prairie-dogs, gophers, woodchucks, 
squirrels, moles, rats, mice, etc., nothing has been 
used with such gratifying results as carbon bisulphid. 
Some years ago, when the writer was located at the 
University of Illinois, several plots of land on the 
Experiment Station farm were overrun with gophers. 
Their presence greatly interfered with the experiments 
being condu¢ted, and carbon bisulphid was used to 
destroy them. The holes or burrows were located. A 
piece of cotton about the size of a hen’s egg was satu- 
rated with the liquid, thrust into the hole, and closed 
with a small piece of sod and loose dirt stamped down 
firmly. A few hours later several of the burrows were 
opened, and in every case a dead animal was found 
with its nose thrust into the cotton. It evidently had 
made an attempt to escape the deadly vapor. 
Amount to use.—A pint of carbon bisulphid, a lit- 
tle more than a pound, is sufficient to treat twenty 
ordinary burrows. ‘The amount used, however, de- 
pends somewhat upon the size and character of the 
burrow. If rather small and in a somewhat compact 
