Hunter, _Laboratory Problems in Civic Biology_. American Book Company. Gannet, _Commercial Geography_. American Book Company. 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_ _(1) Conditions favorable and unfavorable to growth._ _(2) Their relations to mankind._ _(3) Some methods of fighting harmful bacteria and diseases caused by them._ LABORATORY SUGGESTIONS _Field work._--Presence of bracket fungi and chestnut canker. _Home experiment._--Conditions favorable to growth of mold. _Laboratory demonstration._--Growth of mold, structure, drawing. _Home experiment or laboratory demonstration._--Conditions unfavorable for growth of molds. _Demonstration._--Process of fermentation. _Microscopic demonstration._--Growing yeast cells. Drawing. _Home experiment._--Conditions favorable for growth of yeast. _Home experiment._--Conditions favorable for growth of yeast in bread. _Demonstration and experiment._--Where bacteria may be found. _Demonstration._--Methods of growth of bacteria, pure cultures and colonies shown. _Demonstration._--Foods preferred by bacteria. _Demonstration._--Conditions favorable for growth of bacteria. _Demonstration._--Conditions unfavorable for growth of bacteria. _Demonstration by charts, diagrams, etc._--The relation of bacteria to disease in a large city. COLORLESS PLANTS ARE USEFUL AND HARMFUL TO MAN