Sargent, Plants and their Uses. Henry Holt and Company.
Toothaker, Commercial Raw Materials. Ginn and Company.
U. S. Dept. of Agriculture, Farmers' Bulletin 86, Thirty Poisonous Plants of the United States, V. K. Chestnut. Bulletin 17. Two Hundred Weeds, How to Know Them and How to Kill Them, L. H. Dewey.
advanced
Bailey, Cyclopedia of American Agriculture. The Macmillan Company.
XI. PLANTS WITHOUT CHLOROPHYLL IN THEIR RELATION TO MAN
Problems.—(a) How molds and other saprophytic fungi do harm to man.
(b) What yeasts do for mankind.
(c) A study of bacteria with reference to