. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. OF EXPERIMENTAL WORK 2O5 as much chloride. Temperature 12° ± °C. (Lucke and McCutcheon, 1929). H-ion concentration. No effect on penetration of water (Luck^ and McCutcheon, 1926 b). See also Hydrogen Ion. For the effect of pH on penetration of many active compounds which are salts of weak acids or bases, see Smith and Clowes, 1924, and Haywood and Root, 1930, 1932, for bicarbonates; see Krahl and Clowes, 1938 and Hutchens, Krahl, and Clo- wes, 1939, for substituted ph
. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. OF EXPERIMENTAL WORK 2O5 as much chloride. Temperature 12° ± °C. (Lucke and McCutcheon, 1929). H-ion concentration. No effect on penetration of water (Luck^ and McCutcheon, 1926 b). See also Hydrogen Ion. For the effect of pH on penetration of many active compounds which are salts of weak acids or bases, see Smith and Clowes, 1924, and Haywood and Root, 1930, 1932, for bicarbonates; see Krahl and Clowes, 1938 and Hutchens, Krahl, and Clo- wes, 1939, for substituted phenols; see Krahl, 1940, Clowes, Keltch, and Krahl, 1940 for barbiturates and see Krahl, Keltch, and Clowes, 1940 a for local anaes- thetics. Injury. Increase (Lucke and McCutcheon, 1926a, b, 1930, 1932; decrease, Gold- forb, 1935 c). Jelly coat. No effect (R. S. Lillie, 1917). Leucotaxine. Increases k for water from to (Menkin, 1940). Non-electrolytes. Increase k for water from for sea water to for glucose, for saccharose, and for glycocoll (McCutcheon and Lucke, 1928). See also McClendon, 1910 a. Organic extracts. Arbacia egg extracts increase (Glaser, 1914c); manmalian testis and spleen increase (Favilli, 1932). Oxygen lack. Slight increase in k to water, no effect on osmotic equilibrium (Keckwick and E. N. Harvey, 1934); no effect on k for water or ethylene glycol but slight decrease in volume of egg (Hunter and E. N. Harvey, 1936; Hunter, 1936). Sea water concentration. No effect on k for water, as was once supposed (McCut- cheon and Lucke, 1926; Lucke and McCutcheon, 1927, 1932; Lucke, Hartline, and McCutcheon, 1931; Lucke, Larrabee, and Hartline, 1935. Temperature. Higher temperatures greatly increase k to water. Q,in» 2 to 3 and ji. values, 13000-17000 (Lucke and McCutcheon, 1926a, 1932; McCutcheon and Lucke, 1926, 1927, 1932; Lucke, Hartline, and McCutcheon, 1931). No effect on equilibrium (Luck^, 1935). k for ethylene glycol, propio
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