. Chemical embryology. Embryology. SECT. 5] IN ONTOGENESIS 807 solutions to an extent just sufficient to keep the product of the equation constant, but the sea-urchin's eggs did not do this. Fig, 194 shows on curve A the actual behaviour of the eggs, volume being plotted against osmotic pressure of external medium, and B the theoretical curve which should have resulted if the Boyle-Mariotte law had been followed. It is evident that the divergence is greatest in very hypotonic solutions, nil in normal sea water, and again +10 + 9 - + 8 - E ^7 I- > +5 CT) +4 "> .3 C ~ +2 C O +1. 3 4 5
. Chemical embryology. Embryology. SECT. 5] IN ONTOGENESIS 807 solutions to an extent just sufficient to keep the product of the equation constant, but the sea-urchin's eggs did not do this. Fig, 194 shows on curve A the actual behaviour of the eggs, volume being plotted against osmotic pressure of external medium, and B the theoretical curve which should have resulted if the Boyle-Mariotte law had been followed. It is evident that the divergence is greatest in very hypotonic solutions, nil in normal sea water, and again +10 + 9 - + 8 - E ^7 I- > +5 CT) +4 "> .3 C ~ +2 C O +1. 3 4 5 6 7 8 9 10111213 pH Fig. 193. A. Strongylocentrotus. B. Sabellaria. marked in hypertonic solutions. In other words, the sea-urchin's egg opposes a certain amount of resistance to extreme hydration on the one hand, and to extreme dehydration on the other. Ephrussi & Neukomm offered no explanation for these facts, but thought it as difficult to picture any considerable amount of glucose getting into the Qgg from hypertonic solutions as to picture any electrolytes passing out in hypotonic solutions. If Fig. 194 be compared with Fig. 190, the difference between the polychaete and the echinoderm egg as regards the Boyle-Marriotte law will easily be 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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