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March 1951

Pollen-Slide Studies.

AMA Am J Dis Child. 1951;81(3):463. doi:10.1001/archpedi.1951.02040030473014

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This beautiful book was written to assist persons, particularly allergists, not trained in botany to study by simple but reasonably accurate methods the qualitative and quantitative pollen and fungous spore content of the air. This is done through the medium of a text which is chiefly explanatory of 182 separate drawings and 34 photomicrographs. The relation of meteorologic factors to pollination is clearly and briefly discussed. In a book of this character the theory of Wodehouse that the onset and offset of ragweed pollination are determined by photochemical reactions should have been mentioned, along with the accepted theory that the offset of pollination is caused by frost acting to kill the short ragweed. There is also a table of nineteen pages listing the pollens seen on the author's slides made in the District of Columbia from 1938 to 1941. This, having little more than local interest, could easily have been

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