PRUSSIC ACID IN WILD CHERRY LEAVES 



121 



in height, growing upon a lawn (c) ; smaller leaves from a 

 full-grown tree by the roadside ; (d) small, dry, woody leaves 

 from stunted shrubs growing in the shade. 



TABLE III. 



SHOWING INFLUENCE OF CONDITION OF GROWTH. 

 (Results from 100 grams freshly cut leaves.) 



(d) Leaves small, dry, 

 and woody. 



Two analyses. 



42 



The average of ten analyses shows that lOO gnj^ (about ^ 

 lb.) of leaves (a) yield 212 milligrams, or aboLiF^.2 grains, 

 acid, while the same quantity of fresh leaves (d)^ields 42 mil- 

 ligrams acid. The same is noticeable of the chokecherry. It 

 has been observed that the most harmful growth in the latter 

 is that in which the large leaves are of the oval-oblong shape 

 (Fig. 2, b). This shape seems to be a peculiarity of the young 

 growths of this species. On the other hand, leaves from ma- 

 ture shrubs seem usually to possess the obovate or inverted e^g 

 form (Fig. 2, a). 



The symptoms of cherry poisoning in cattle as stated by Dr. 

 Chestnut, in his bulletin, " Principal Poisonous Plants of the 

 U. S.," include, " labored respiration, diminished pulse, 

 numbness, fright, protruding eyeballs, convulsions, and death 



