Jan., 1910.] 



Ohio Groicn Rubber, Crop of 1910. 



OHIO GROWN RUBBER, CROP OF 1910.* 



Charles P. Fox. 



Product of Common Milkweed (Asclepias syriaca). A com- 

 mon plant belonging to tlic Asclcpiadaceac; found abundantly 

 tlirougliout 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. 



