XI. PLANTS WITHOUT CHLOROPHYLL IN THEIR 



RELATION TO MAN 



Problems. - - (a) How molds and oilier saprophytic fungi do 

 harm to man. 



(&) What yeasts do for mankind. 



(e) 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 col- 

 onies 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 



The Fungi. - We have found that green plants on the whole 

 are useful to mankind. But not all plants are green. Most of 

 us are familiar with the edible mushroom sold in the markets or 



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