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IV.—CoLoRADO POTATO-BEETLE. (Doryphora 10-lineata Say.) 
EXPERIMENT 1.—WOLF’S SOAP. 
Solution, 1 ounce to1 gallon of water. Temperature normal. Sprayed 
on a number of adults. 
Result.—Tweuty-four hours after, none were injured. 
EXPERIMENT 2.—WOLF’S SOAP. 
Solution and temperature same asin Experiment 1. Sprayed larva 
of various sizes about as I would apply Paris green and water. 
Result.—Only a small number of the youngest were destroyed. 
EXPERIMENT 3.—WOLE’S SOAP. 
Solution of 3 ounces to 1 gallon of water, applied to nearly full-grown 
Jarve on potato vines. 
Result.—Nearly all were alive next day. 
EXPERIMENT 4.—WOLE’S SOAP. 
Solution of 3 ounces to 1 gallon of water. Sprayed on tomato vines 
being eaten by nearly full-grown larve and adults. 
Result.—Two hours after, both larve and adults had left the vines, 
but I found no dead. Three days after, adults were again feeding on 
the same vines, but no larve were observed to return. 
EXPERIMENT 5.—AMMONIA AND WATER. 
Solution of 3 tablespoonfuls of ammonia to 1 gallon water. Sprayed 
on plants infested by larve of various sizes. 
Result.—One day after, only a very few of the youngest larve had 
been destroyed. 
EXPERIMENT 6.—AMMONIA AND WATER. 
Solution asin Experiment 5. Placed enough of this mixture in glass 
to cover bottom ; put in glass nearly full grown larve and beetles, shook 
thoroughly, turned off fluid and insects and inverted the glass over 
them. 
Kesult.—Not a single larva or adult was injured. 
EXPERIMENT 7.—AMMONIA AND WATER. 
Solution, 1 tablespoonful to 1 quart of water; applied as in Experi- 
ment 6. 
Result.—The same as in previous experiment. 
EXPERIMENT 8.—CARBOLATE OF LIME. 
Sprinkled thickly on tomato vines that were being eaten by adults 
and larve. 
