. Chemical embryology. Embryology. 8o6 BIOPHYSICAL PHENOMENA [PT. Ill similar curve to Faure-Fremiet's for the effect of heat on imbibition of water, and in collaboration with Neukomm for the effect of pH on imbibition (see Figs. 192 and 193). McCutcheon & Lucke, on the other hand, maintained that for Arbacia pH had no effect, but their measurements were rather few. The spermatozoa were, Ephrussi found, less susceptible to heat than the unfertilised eggs. The normal osmotic pressure of the egg-contents in Strongylocentrotus lividus was 25 atmospheres, practically isotonic with sea wat
. Chemical embryology. Embryology. 8o6 BIOPHYSICAL PHENOMENA [PT. Ill similar curve to Faure-Fremiet's for the effect of heat on imbibition of water, and in collaboration with Neukomm for the effect of pH on imbibition (see Figs. 192 and 193). McCutcheon & Lucke, on the other hand, maintained that for Arbacia pH had no effect, but their measurements were rather few. The spermatozoa were, Ephrussi found, less susceptible to heat than the unfertilised eggs. The normal osmotic pressure of the egg-contents in Strongylocentrotus lividus was 25 atmospheres, practically isotonic with sea water. Heating at > -d \P. 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 TempercLtare (°C) Fig. 192. A. Strong^iocentrotus. B. Sabellaria. different temperatures for a short time led to [a) a rise in the internal osmotic pressure, and [b) a subsequent fall, the whole curve forming a peak, the angle of which was the more acute the higher the tempera- ture. Ephrussi concluded that two irreversible processes were in operation. Perhaps the most interesting result obtained by Faure-Fremiet on Sabellaria eggs in this connection was the finding that the eggs obeyed the Boyle-Mariotte law. Ephrussi & Neukomm could not show that this was so for Strongylocentrotus eggs. If j&F = K holds good, the eggs should swell in hypotonic solutions and shrink in hypertonic. 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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