. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 340 E. GELLHORN METHOD The experiments were chiefly performed on the sartorius muscle of Rana esculenta between January and April, 1930. Frogs of medium size, which did not vary more than 10 per cent in weight, were chosen. The sartorii were prepared carefully in the usual manner and suspended between platinum electrodes. The muscles were kept in the salt solution, which was aerated with purified oxygen. At intervals of about thirty minutes the threshold of the muscle was determined cm. 35 30 25 20 15 10 0. 20 40 60 80 100 1
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 340 E. GELLHORN METHOD The experiments were chiefly performed on the sartorius muscle of Rana esculenta between January and April, 1930. Frogs of medium size, which did not vary more than 10 per cent in weight, were chosen. The sartorii were prepared carefully in the usual manner and suspended between platinum electrodes. The muscles were kept in the salt solution, which was aerated with purified oxygen. At intervals of about thirty minutes the threshold of the muscle was determined cm. 35 30 25 20 15 10 0. 20 40 60 80 100 120 140 160 180 min. FIG. 1. The influence of the variation of KC1—-Nad and CaCU being constant —upon the irritability of the sartorius. Ordinate: threshold in cm. distance between primary and secondary coil. Abscissa: time in minutes. M NaCl + M X 10~« CaCl2 + M X 10~« KC1 + 17 M X 10~4 KC1 - + 20 MX10-4KC1 + 23 MX 10-4 KC1 —•—•—•- after having removed the muscle from the liquid. The interrupted current of an induction coil, the primary circuit of which was supplied with one dry cell ( volts), was used. In a series of preliminary experiments it was found that if at constant NaCl and CaCl2 content the influence of increasing KC1 concentration was investigated during the observation time of three hours, a sharp distinction between two groups of KC1 effects could be made. In the first group, containing. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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