. Contributions to embryology. Embryology. MUSCULAR CONTRACTION IN TISSUE-CULTURES. 203 the rhythmical contractions was rapid, about 70 to 120 per minute. Owing to the rapid shortening and thickening, together with the slight pendular movement, the phenomenon of contraction exhibited by the few entirely isolated cells observed had the character of a distinct beat as though the single cell constituted in itself a minute force pump rather than an infinitesimal part in such a structure. Figure 4 shows a few of the changes of form through which an isolated contracting cell passed within the period
. Contributions to embryology. Embryology. MUSCULAR CONTRACTION IN TISSUE-CULTURES. 203 the rhythmical contractions was rapid, about 70 to 120 per minute. Owing to the rapid shortening and thickening, together with the slight pendular movement, the phenomenon of contraction exhibited by the few entirely isolated cells observed had the character of a distinct beat as though the single cell constituted in itself a minute force pump rather than an infinitesimal part in such a structure. Figure 4 shows a few of the changes of form through which an isolated contracting cell passed within the period of a few hours. Tliis cell, although exhibiting contrac- tions at the rate of 115 per minute, formed several pseudopocha while under observa- FiG. 4.—Changes in shape exhibited by a heart-muscle cell while undergoing rhythmical con- traction. Drawn at intervals of minutes. Rate 115 beats per minute. Culture 48 hours old from heart of 4-day chick em- bryo. Oc. 4, oil- 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, D. C
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