. Chemical embryology. Embryology. SECT. 2] AND WEIGHT 539 into the air-space of chick eggs on the 5th day of development. The effect was absolutely nil, as is seen from Figs, 87 & 88 where his points are plotted both for wet and dry weight. There is thus a certain con- tradiction between the results of Willier and those of Hanan; Okada afterwards repeated Hanan's experiment, and observed no effect on the general appearance, but an 18 % decrease in length and weight. of the chicks from the injected eggs. There were characteristic histo- logical changes, mostly in the direction of precocity
. Chemical embryology. Embryology. SECT. 2] AND WEIGHT 539 into the air-space of chick eggs on the 5th day of development. The effect was absolutely nil, as is seen from Figs, 87 & 88 where his points are plotted both for wet and dry weight. There is thus a certain con- tradiction between the results of Willier and those of Hanan; Okada afterwards repeated Hanan's experiment, and observed no effect on the general appearance, but an 18 % decrease in length and weight. of the chicks from the injected eggs. There were characteristic histo- logical changes, mostly in the direction of precocity. Okada's results would fit in with Butler's finding of a decrease in cell-division rate under the influence of thyroxin in Arbacia eggs. Pituitrin has also been injected into hen's eggs, by Cunningham & Stanfield, who obtained the following results: Average weights (gm.) Injection 7th day, opened gth Injection 7th day, allowed to hatch Injection 6th day, opened 8th /â > Control Injected embryos embryos 1-578 i-goi 37-4 400 0950 I 203. 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
