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The meeting was then turned over to Professor E. W. 

 Sinnott of Barnard College who conducted the "Symposium on 

 Some New Materials and Methods of Value in Botanical 

 Teaching." Dr. Sinnott made a brief comment on his own work 

 in plant breeding, stressing particularly the importance of 

 heterozygosis. 



He then called on Dr. Harper who discussed Growth in 

 Plants, and remarked on what wonderful contrivances the 

 hereditary genes must be which control growth. He particu- 

 larly stressed the behavior of the myxomycetes which develop 

 during life as amoeboid slime molds in which apparently each 

 individual cell is independent of every other. At fruting time 

 these cells build this into complex fruiting bodies which are 

 always very regular in character. Just how do the genes in the 

 cells cause each one of these to assume its proper place in this 

 fruiting structure? 



Dr. Benedict was then called upon for a discussion of 

 Fruit Morphology. He took as an example the apple and 

 explained in detail its structure and development. 



Dr. Forman T. McLean talked about Mineral Nutrition of 

 Plants and distributed an outline of his talk giving brief direc- 

 tions for setting up sand cultures to show the need of the 

 fertilizer elements of plants and solution cultures to similarly 

 show the need for the ten so-called essential elements. He 

 stressed the fact that there are now recognized many more than 

 ten chemical elements required by green plants but that the 

 exact number is not yet fully determined. 



Mr. Charles A. Gramet of Stuyvesant High School then 

 exhibited demonstrations of Photosynthesis by the water 

 displacement method. He particularly stressed the importance 

 of experiments by Ingen-Housz and made it quite clear that 

 any kind of plants can be used in these experiments, it not 

 being necessary to use exclusively water plants. 



Dr. E. B. Matzke then told us about the studies to determine 

 the fundamental shape of plant cells in undifferentiated tissues. 

 According to the most conclusive evidence, such cells are not 

 dodecahedrons but fourteen sided figures with faces consisting 

 of squares and triangles. 



Dr. B. O. Dodge discussed Sex in Fungi and showed how 

 one may use mucor to show sexual reproduction in the phy- 



