. Chemical embryology. Embryology. 5o8 ON INCREASE IN SIZE [PT. Ill As Ephrussi says, the correspondence can hardly be a mere coin- cidence, and in any case the fact that change of temperature has almost no effect on process C must be significant. We do not know whether the effect of increased temperature is greater on the mitotic or inter-mitotic period. Bucciante main- tained chick embryo explants at 31° and at 41° and counted no more mitoses during a given amount of growth in the latter than in ^ the former, so he concluded that '~ the effect was the same. Loeb & Wasteneys found 2-3 for
. Chemical embryology. Embryology. 5o8 ON INCREASE IN SIZE [PT. Ill As Ephrussi says, the correspondence can hardly be a mere coin- cidence, and in any case the fact that change of temperature has almost no effect on process C must be significant. We do not know whether the effect of increased temperature is greater on the mitotic or inter-mitotic period. Bucciante main- tained chick embryo explants at 31° and at 41° and counted no more mitoses during a given amount of growth in the latter than in ^ the former, so he concluded that '~ the effect was the same. Loeb & Wasteneys found 2-3 for the embryonic growth of Arbacia and Bohr 2-9 for that of the snake Coluber natrix. Warburg gave 2-5 for the respiratory in- crease of Arbacia eggs. Herzog, working on the figures of Dan- nevig for the hatching time of the plaice egg {Pleuronectes platessa), got a Q^io of 2-5, on those of Earll for the cod egg [Gadus morrhua) 3-4 and 2-3, and on those of Ainsworth and Metzger for two different kinds of trout egg 3-4 and 5-3. Later, Bachrach & Cardot obtained a value of 3-2 for the embryonic growth of the slug Agriolimax agrestis between 6 and 23°, and one of 3-06 for that of the water snail Limnaea stagnalis between 11 and 32°. For Ascaris megalocephala Zavadovski got a Q^^q of 2-8, but it was markedly higher at low temperatures than at higher ones. Then later, Zavadovski & Sidorov gave Q^io (18-28°) 3-12 for Toxascaris limbata, 3-12 for Ascaris megalocephala and 3-23 for Ascaris suilla, but 1-45, 1-46 and 0-73 respectively between 28 and 38°. Brown has also published a Q^^q for Ascaris, Berrill for Lophius americanus, Harukawa for the oriental peach-moth, Kawajiri for Salmo irideus, Nakai for Plecoglossus altivelis, Kojiyama for Pagrosoma major. But the older phase of the work on the effect of temperature on embryonic growth could not lead to any definite conclusions about. Please note that these images are extracted from scanned page images that may have been di
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Keywords: ., bookcentury1900, bookpublishernewyorkthem, booksubjectembryology
