16 
IV. — Colorado Potato-Beetle. (Doryphora 10 -lineata Say.) 
Experiment 1. — WOLF’S SOAP. 
Solution, 1 ounce to 1 gallon of water. Temperature normal. Sprayed 
on a number of adults. 
Result. — Tweuty-four Lours after, none were injured. 
Experiment 2. — WOLF’S SOAP. 
Solution and temperature same as in Experiment 1. Sprayed larvae 
of various sizes about as I would apply Paris green and w^ater. 
Result. — Only a small number of tbe youngest were destroyed. 
Experiment 3.— WOLF’S SOAP. 
Solution of 3 ounces to 1 gallon of water, applied to nearly full-grown 
larvae on potato vines. 
Result. — Nearly all were alive next day. 
Experiment 4.— WOLF’S SOAP. 
Solution of 3 ounces to 1 gallon of water. Sprayed on tomato vines 
being eaten by nearly full-grown larvae and adults. 
Result. — Two Lours after, botL larvae and adults Lad left tlie vines, 
but I found no dead. TLree days after, adults were again feeding on 
tbe same vines, but no larvae were observed to return. 
Experiment 5.— AMMONIA AND WATER. 
Solution of 3 tablespoonfuls of ammonia to 1 gallon water. Sprayed 
on plants infested by larvae of various sizes. 
Result. — One day after, only a very few of tbe youngest larvae Lad 
been destroyed. 
Experiment C.— AMMONIA AND WATER. 
Solution as in Experiment 5. Placed enough of this mixture in glass 
to cover bottom ; put in glass nearly full grown larvae and beetles, shook 
thoroughly, turned off fluid and insects and inverted the glass over 
them. 
Result. — Not a single larva or adult was injured. 
Experiment 7.— AMMONIA AND WATER. 
Solution, 1 tablespoouful to 1 quart of water; applied as in Experi- 
ment 0. 
Result. — The same as in previous experiment. 
Experiment 8. — CARBOLATE OF LIME. 
Sprinkled thickly on tomato vines that were being eaten by adults 
and larvae. 
