194 The Columbus, Ohio, Meeting 



Symposia 



"Relational Thinking in Secondary Mathematics" (12 papers). National 

 Council of Teachers of Mathematics. 



"Isotopes" (13 papers). Section on Chemistry. 



"Photosynthesis" (14 papers at regular sessions and a round-table discus- 

 sion after dinner). Section on Chemistry. 



"Glacial and Geomorphic Development of the Ohio Basin" (12 papers). 

 Section on Geology and Geography, Geological Society of America and 

 Ohio Academy of Science (Section on Geology). 



"Industrial Minerals" (9 papers). Section on Geology and Geography 

 and Geological Society of America. 



"Paleozoic Stratigraphy of the Ohio Basin" (13 papers). Section on 

 Geology and Geography, Geological Society of America and Ohio Academy 

 of Science (Section on Geology). 



"Meteorite Falls and Meteorite Accretion" (5 papers). Section on Ge- 

 ology and Society for Research on Meteorites. 



"Applications of Mathematics to the Earth Sciences" (5 papers). Sec- 

 tion on Geology and Geography, Section on Mathematics, American Mathe- 

 matical Society, Mathematical Association of America and Geological 

 Society of America. 



"Hydrologic Problems in the Ohio and Michigan Basins" (6 papers). 

 Section on Geology and Geography, Geological Society of America (Sec- 

 tion on Hydrology), American Geophysical Union and Ohio Academy of 

 Sciences (Section on Geology). 



"Speciation" (5 papers). American Society of Zoologists and Genetics 

 Society of America. 



"Experimental Study of Cellular Organization" (5 papers). American 

 Society of Zoologists. 



"Fifty Years of Entomological Progress" (5 papers). American Asso- 

 ciation of Economic Entomologists and Entomological Society of America. 



"Viruses and Plant Quarantines" (4 papers). American Association of 

 Economic Entomologists and American Phytopathological Society. 



"Training for the Various Fields of Entomology" (5 papers). American 

 Association of Economic Entomologists. 



"Physiological Processes of Plants in Relation to Temperature" (5 

 papers). Botanical Society of America (Physiological Section), American 

 Society for Horticultural Science and American Society of Plant Physiolo- 

 gists. 



"Defense Mechanisms in Plants and Animals" (3 papers). Botanical 

 Society of America, American Society of Naturalists, American Society of 

 Zoologists, Genetics Society of America and Section on Medical Sciences. 



