33« 
Journal of Agricultural Research 
Vol. XI, No. 7 
(25) Woodworth, C. W. 
1915. the; toxicity of insecticides. In Science, n. s., v. 41, no. 1053, p. 
367-369. 
(26) Zieger, Rudolf. 
1915. zur kenntnis dEr katalasE der niederen tierE. In Biochem. 
Ztschr., Bd. 69, Heft 1/2, p. 39-110. 
PLATE 34 
A. —Tomato plants in the greenhouse at beginning of growth experiment. Note 
the curling of leaves in set 17. 
B. —Tomato plants when in fruit, showing the method of handling. 
