. Carnegie Institution of Washington publication. Effect of Different Temperatures on the Medusa Cassiopea. 31 So much for a vindication of the experimental method. As for the results, they have been in part stated in my preliminary Using the sense-organs as the source of stimulus and a temperature interval of 24° to 34° there is without doubt a very marked increased efficiency of both MgCl2 and CH3COOH in stopping both contraction and conduc- tion at the higher temperature (34°). At 34° functioning ceases 2 to times as soon as at 24°. This value is identical with van't Hoff's
. Carnegie Institution of Washington publication. Effect of Different Temperatures on the Medusa Cassiopea. 31 So much for a vindication of the experimental method. As for the results, they have been in part stated in my preliminary Using the sense-organs as the source of stimulus and a temperature interval of 24° to 34° there is without doubt a very marked increased efficiency of both MgCl2 and CH3COOH in stopping both contraction and conduc- tion at the higher temperature (34°). At 34° functioning ceases 2 to times as soon as at 24°. This value is identical with van't Hoff's coeffi- cient (2 to 3) for increase in velocity of chemical reactions with 10° rise of temperature. Inasmuch as a similar value was not obtained with 20° to 30° as the 10° interval, and the stimulus given out by the sense-organs may have varied in strength at different temperatures, it has seemed better not to publish any data until further experiments can be made. It is hoped that they will afford sufficient evidence to decide the question. TEMPERATURE LIMITS OF ACTIVITY AND THERMAL DEATH-POINTS OF MUSCLE AND NERVE. METHOD. The muscles and nerves of Cassiopea form a layer almost as thin as paper over the whole of the subumbrella surface, the nerves outermost. Although intimately connected and impossible to separate by dissec- tion, the greater resistance of the nerves to temperature extremes renders possible a study of their properties apart from the muscles. This is done in the following way, first described by Mayer 3 in studying the effects of salts. A long strip of disk-tissue with several sense-organs on one end is laid across three dishes filled with sea-water (A, B, and c, fig. i).. 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 Carnegie Institution of Washington. Washington, Carnegie Inst
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