Jan., 1910.] 
Ohio Grown Rubber, Crop of 1910. 
271 
OHIO GROWN RUBBER, CROP OF 1910.* 
Charles P. Fox. 
Product of Common Milkweed (Asclepias syriaca). A com- 
mon plant belonging to the Asclepiadaceae ; found abundantly 
throughout the United States; classed as a weed, convicted as a 
bee-killer, advocated as a rubber producer. Too well known to 
need description. 
Asclepias syriaca. 
Latex. Milk-like, thin; acid or neutral reaction; characteris- 
tic odor of milkweed; does not coagulate on standing in a closed 
vessel; imperfectly coagulated by acids; thickened or partially 
coagulated by ammonia; coagulated by heat; coagulated by 
alcohol. 
* Presented at the Twentieth Annual Meeting, Ohio Acad, of Sci., 
Akron, Nov. 25. 
