PHYSIOLOGICAL PROCESSES IN PLANTS 111 



Keeler, Our Northern Shrubs and how to identify Them. 



Our Native Trees and how to identify Them. 



Rogers, J.E., Trees Every Child should Know. 



Wyman, A. P., " Leaves and Acorns of our Common Oaks." Teachers' 

 Leaflet, Nature Study, No. 8, Cornell University, September, 1897. 



Graves, G. S., "The Advance of Forestry in the United States." 

 Review of Reviews, April, 1910. 



Newell, F. H., "The Reclamation of the West." Annual Report 

 Smithsonian Institution, 1904, p. 827. 



Burba, G. F., "Tree Surgery." Pearson's Magazine, April, 1910. 



Burroughs, John, "The True Test of Nature Literature." Country 

 Life in America, May, 1904. 



"Songs of Nature," Country Life in America, December, 1906. 



Finch, William C., Water. 



PROBLEM XX (Optional) 



Some forms of plant life with special reference to 

 nutrition and reproduction. 



a. An Alga 



Pond Scum (Spirogyra) 

 1. GENERAL 



Method. Mount some of the material in water and study with low 

 power of a microscope. 



Observations. 1. What is the shape of a single plant ? Note. A 

 threadlike body is called a filament. 



2. Is it one-celled or many-celled ? 



3. Can you find any roots or leaves ? 



4. What is the color ? What are plants that contain chlorophyll able 

 to manufacture ? 



Conclusions. 1. Would you consider this plant to be simple or 

 complex ? 



2. Show if any part corresponds in function to leaves. 



2. EEPRODUCTION 

 (a) Sexual 



Observations. 1. Find filaments joined so as to form ladder-like 

 structures. Here cells send out tubes which connect with similar tubes 



