. Carnegie Institution of Washington publication. Nerve-Conduction in Cassiopea Xamachana. 13 we shall show, appears to be directly proportional to the concentration of the surrounding cations of sodium, potassium, and calcium, mag- nesium taking an almost negative part in the control of rate of nerve- conduction in diluted sea-water. Table 5 (illustrated by fig. 8) shows the rates of nerve-conduction in Cassiopea in Tortugas sea-water diluted with aerated, alkaline distilled water having a hydrogen-ion concentration of ;8, or PH. TABLE 5. Composition of the solution. Average
. Carnegie Institution of Washington publication. Nerve-Conduction in Cassiopea Xamachana. 13 we shall show, appears to be directly proportional to the concentration of the surrounding cations of sodium, potassium, and calcium, mag- nesium taking an almost negative part in the control of rate of nerve- conduction in diluted sea-water. Table 5 (illustrated by fig. 8) shows the rates of nerve-conduction in Cassiopea in Tortugas sea-water diluted with aerated, alkaline distilled water having a hydrogen-ion concentration of ;8, or PH. TABLE 5. Composition of the solution. Average rate of nerve-con- duction. Electrical conductivity of Tortugas sea-water diluted with distilled water of PH at 30° C. determined by Kohl- rausch's method. Natural s ea-water of PH to 100 100 95 of sea-water + 5 of distilled water. 90 ' ' + 10 ' " " .... 80 ' ' + 20 ' " " 70 ' ' + 30 60 ' ' + 40 ' " " 50 ' ' + 50 ' " " 120. 33 32 31 30 29 28 27 Temperature 26 25 24 Z3 FIG. 9.—Showing that the temperature coefficient for the rate of nerve-con- duction in Cassiopea is times as great as that of the electrical conductivity of the sea-water. The close resemblance between the decline in rate of nerve-conduc- tion and the corresponding decline in electrical conductivity of the surrounding sea-water suggests but does not prove that the two phe- nomena are directly dependent one upon the other; but as we shall show later, this seems 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 Institution of Washington
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