. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FIG. 147 I found that a trace of Nag CO 3 has that effect. In a solu- tion of 95 |n NaCl + 2 V" n CaClg +1 |n ECl + 1 ^n NaCOg a skeleton was formed within three days. This skeleton was not quite normal. It showed a formation of knobs and spheres which I never saw in the skeleton formed in normal sea-water (Fig. 147 B). I was anxious to obtain plutei with normal skeletons, and succeeded in doing so by adding a trace of MgCl^ to the above-mentioned
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FIG. 147 I found that a trace of Nag CO 3 has that effect. In a solu- tion of 95 |n NaCl + 2 V" n CaClg +1 |n ECl + 1 ^n NaCOg a skeleton was formed within three days. This skeleton was not quite normal. It showed a formation of knobs and spheres which I never saw in the skeleton formed in normal sea-water (Fig. 147 B). I was anxious to obtain plutei with normal skeletons, and succeeded in doing so by adding a trace of MgCl^ to the above-mentioned solution. The solution which yielded plutei with a normal skeleton con- sisted of 95 ^n NaCl + 1 y n Mf,-Cl2 + 1 |m KCl + 2 Vn CaClg + 1 Jn NagCOg. The skele- ton is sketched in Fig. 147, A. It was therefore evident that 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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