. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 146 Studies in General Physiology over, I had the opportunity of studying new relations be- tween irritability and body form, and in addition one of .the fundamental conditions which underlie growth. These lat- ter observations point to a greater similarity between the general life-phenomena of animals and plants than has thus far been fig. 26 The experiments were made upon Cerianthus membrana- ceus. The animal consists of a long, soft, and smooth cylindrical body,
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 146 Studies in General Physiology over, I had the opportunity of studying new relations be- tween irritability and body form, and in addition one of .the fundamental conditions which underlie growth. These lat- ter observations point to a greater similarity between the general life-phenomena of animals and plants than has thus far been fig. 26 The experiments were made upon Cerianthus membrana- ceus. The animal consists of a long, soft, and smooth cylindrical body, carrying a heavy crown of tentacles at its oral end (Fig. 26, a), while at its aboral end (Fig. 26, 6) it is smooth and rounded. The tentacles at the oral pole are arranged about the oral plate in two concentric circles; the outer circle consists of long, the inner of thin and short tentacles. In the middle of the circle is situated the oral opening, which serves also the functions of an anus. The body of the animal is hollow Digitized by Microsoft®. 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 Loeb, Jacques, 1859-1924. Chicago, The University of Chicago Press
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