POISONING AND TRAPPING 299 
melon-rind and the like are favorite baits. 
Crystals of strychnine sulphate are inserted in 
them and they are left along rabbit-runs, either 
on the ground or elevated on short sticks. Arti- 
ficial rans may be made in orchards with a drag 
or a one-horse scraper. Another excellent bait 
is oatmeal soaked in strychnine sirup. In any 
case the rabbits must be carefully fenced away 
from haystacks, or they may not eat the poi- 
soned bait. 
Poisoning prairie-dogs and ground-squir- 
rels. A few years ago the State of Kansas 
carried on extensive operations against prairie- 
dogs, destroying them almost completely over 
nearly 2,000,000 acres of thickly infested land. 
The poison was prepared at the State Agricul- 
tural College, and was sold to townships and 
individuals at cost, or the formula for prepar- 
ing it was given to citizens who asked for it. 
A modification was found necessary, however, 
when the mixture was to be used in large 
quantities and this was perfected by David E. 
Lantz, with the following result: For 1 gallon 
poisoned sirup, use— 
