Some Phases of the Relation of Temperature to the Development of Insects (Classic Reprint) - Hardcover

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Excerpt from Some Phases of the Relation of Temperature to the Development of Insects<br/><br/>Investigators early in the modern scientific era recognized the in?uence which temperature exerted upon the rate of growth in plants. Reaumur, as early as 1735, recognized this relation as a quantitative one and suggested the idea that the total amount of heat, expressed as temperature summations, required to produce a given growth effect, was a constant. The method of summation, as used by Reaumur, assumed that temperatures above the zero of his thermometer, i. E., the freezing point of water, were effective while those below zero were not. Variations in the experimentally determined thermal constants were later associated with the effect of other climatic factors in the processes of growth and led to the search for more accurate meth ods for the summation of temperatures. Credit appears to be due de Candolle (1832, wide de Candolle 1855) for the statement that effective temperatures do not necessarily persist down to zero but that some point above zero should often be used as the basis for summations of the thermal increment. From the time of de Candolle's early work progress for some fifty years was mostly in the line of accumulation of statistics in which many investigators participated.

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