. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FIG. n FIG. 18 FIG. 19 root, and fixed them vertically, but with their tips down- ward, into the sand. The tips were planted just deeply enough to keep the animals in a vertical position. The remaining part of the stem was surrounded by water. In a number of these animals new tips, which continued to grow upward, were formed at the basal ends (Figs. 18, 19). At first the old main stem grew in length by growing vertically upward. From this there then arose the lateral branc
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FIG. n FIG. 18 FIG. 19 root, and fixed them vertically, but with their tips down- ward, into the sand. The tips were planted just deeply enough to keep the animals in a vertical position. The remaining part of the stem was surrounded by water. In a number of these animals new tips, which continued to grow upward, were formed at the basal ends (Figs. 18, 19). At first the old main stem grew in length by growing vertically upward. From this there then arose the lateral branches. The new polyps which were formed grew only upon the 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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