. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). Heteeomoephosis 137 stem upon the glass remained permanently the same, though the tip itself moved forward at the rate of about 1mm. each day. The longitudinal growth must, therefore, have occurred in the narrowzone lying in front of the new stem. 13. These experiments were made in April when the Aglaophenise were sex- ually mature. One day I observed a number of small (about -Jmm. long), whitish, cone-shaped larvae that moved over the bottom of the aquarium toward the win
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). Heteeomoephosis 137 stem upon the glass remained permanently the same, though the tip itself moved forward at the rate of about 1mm. each day. The longitudinal growth must, therefore, have occurred in the narrowzone lying in front of the new stem. 13. These experiments were made in April when the Aglaophenise were sex- ually mature. One day I observed a number of small (about -Jmm. long), whitish, cone-shaped larvae that moved over the bottom of the aquarium toward the window, and remained there. The next morning, however, they had all disappeared, so that I can only suspect that these organisms, which in the moment of observation were positively heliotropic, may have been larvae of Aglao- phenia. VI. HETEEOMOEPHOSIS IN PLUMULAKIA PINNATA 1. I have made a series of FIG. 200 FIG. 206 experiments, similar to those made upon Aglaophenia, upon Plumularia pinnata, which in form closely resembles Aglaophenia pluma. I wish to describe one of these experiments here. A series of stalks were cut off close to the root and fixed vertically in the sand, so that the apical ends were covered by it. In individual instances, but only very rarely, a new tip was immediately formed at the aboral end, so that I ob- tained biapical animals similar to those of Aglaophenia. 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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