. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOLOTHURIAN MUSCLE AND OXYGEN LACK 77 distance above the base line than in the beginning. Finally both am- plitude and tone fell markedly. The rate of beat decreased constantly from five or six at the beginning to two or three per minute during the periods of beating. The length of the periods of inhibition of beat gradually increased to three or four minutes. Boiled Sea Water.—Sea water which had been boiled in a narrow- necked flask and cooled to laboratory sea water temperature (28° C. or 29° C.) was used. When the muscle
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOLOTHURIAN MUSCLE AND OXYGEN LACK 77 distance above the base line than in the beginning. Finally both am- plitude and tone fell markedly. The rate of beat decreased constantly from five or six at the beginning to two or three per minute during the periods of beating. The length of the periods of inhibition of beat gradually increased to three or four minutes. Boiled Sea Water.—Sea water which had been boiled in a narrow- necked flask and cooled to laboratory sea water temperature (28° C. or 29° C.) was used. When the muscle strip was immersed in 100 cc. of this water, the first two or three beats usually increased in amplitude, but both tone and amplitude almost immediately fell and the strip ceased beating in from three to five minutes as shown in Fig. 3, A. If the. FIG. 3. A. Cloaca! strip in 100 cc. of boiled sea water. pH B. Cloacal strip in 100 cc. of boiled sea water treated with dioxide, pH Aeration at X. C. Cloacal strip in 100 cc. of boiled sea water, pH Aeration at A'. pH immediately after aeration. pH after 102 minutes. water was aerated within three minutes by sucking it into a hypodermic syringe and squirting it back forcibly, a partial recovery occurred, which showed periodicity at first but later an uninterrupted rhythm (see Fig. 3, C). Several attempts to bring about recovery after waiting a longer period failed. The pH of the boiled sea water (indicator method) was sometimes as high as as compared with to , the pH for unboiled sea water in this 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; Moo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
