. Chemical embryology. Embryology. SECT. 2] AND WEIGHT 509 the nature of the Hmiting factor or master process, in view of the fact that Q^^Q itself was not a satisfactory standard. When a physical process of diffusion (Nernst) could have a coefficient practically identical with a chemical process (saponification of ethyl butyrate by baryta, Trautz & Volkmann), both being about 1-3, it was difficult to say what might be producing a given Q,io • But more serious was the fact which soon became apparent, namely, that many cases of. embryonic development could equally well be said to be simply
. Chemical embryology. Embryology. SECT. 2] AND WEIGHT 509 the nature of the Hmiting factor or master process, in view of the fact that Q^^Q itself was not a satisfactory standard. When a physical process of diffusion (Nernst) could have a coefficient practically identical with a chemical process (saponification of ethyl butyrate by baryta, Trautz & Volkmann), both being about 1-3, it was difficult to say what might be producing a given Q,io • But more serious was the fact which soon became apparent, namely, that many cases of. embryonic development could equally well be said to be simply linear functions of the temperature. Krogh was the first to find this. In considering the figures which had been obtained by Krogh & Johansen and by Dannevig on the rate of development of fish eggs and the hatching times at diflferent temperatures, he found that the relation with velocity was a straight line and not an exponential curve, and that the relation with time was a curve which was not exponential but was a hyperbola. This is seen in Figs. 78 and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Needham, Joseph, 1900-. New York: The MacMillan Co.
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Keywords: ., bookcentury1900, bookpublishernewyorkthem, booksubjectembryology
