206 INSECTS AFFECTING THE OKANGE. 



Table 4. — Ckude carbolic acid (oil of creosote). 



In Table 4 are given results of experiments with carbolic acid in solution and com- 

 bined with other substances. 



In experiment No. 27, 9 fluid ounces of carbolic acid was applied to a single tree 

 about five years old. The tree, which was badly infested with Long Scale, and had 

 many branches dead and dying, was severely defoliated, and lost some moribund 

 branches, but recovered in six weeks aud pushed out uew growth in midwinter. 



In experiment No. 30 a pint measure of crumbled carbolic soap was applied. The 

 actual amount of acid contained in this soap did not exceed 2 fluid ounces. The ex- 

 termination of Long Scale was complete. The tree, which was very badly infested 

 aud in poor condition, was almost completely defoliated and lost half its branches, 

 but recovered very rapidly and pushed out new leaves within thirty days. (January 

 25.) 



In experiment No. 21 the other substances added to the carbolic solution increased 

 the injury to the foliage of the tree and it was very severely checked, but entirely re- 

 covered and was stimulated to vigorous growth at a time when all surrounding trees 

 were dormant. 



In the remaining experiments, 13, 14, 15, and 12, the quantity of carbolic acid used 

 was not sufficient to kill the Scale-insects. The effect upon the trees was also very 

 slight. 



