PROBLEM 86 



107 



Problem 86 : To learn to know some green plants harmful to 

 man. 



Materials. — Copies of Chestnut's Thirty Poisonous Plants of 

 the U. S., Farmers' Bulletin 86, and Dewey's Two Hundred Weeds, 

 How to Know Them and How to Kill Them, Farmers' Bulletin 17. 

 A few of the common plants which are weeds in your locality. 

 (Poison ivy can be studied if placed in air-tight jars.) 



Method and Observations. — Using Farmers' Bulletin 86, iden- 

 tify and give the characters by which you would know the follow- 

 ing : pokeweed, corn cockle, black cherry, loco weed (very harmful 

 in the West), snow-on-the-mountain, poison ivy, poison oak, 

 poison sumac, water hemlock, poison hemlock, poison weed, black 

 nightshade. Using Farmers' Bulletin 17, identify and classify 

 ten of the most common weeds of eastern United States. 



Conclusion. — 1. Write a paragraph on some one poisonous 

 plant and the best means of eradicating it from your vicinity. 



