. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 92 Studies in General Physiology Spirographis Spallanzanii, each about 15 cm. long, on the bottom of the aquarium, with the longitudinal axes of their tubes perpendicular to the plane of the window. Eight of them lay with their oral poles toward the room side efgh (Fig. 7) of the aquarium; one with its oral pole toward the window side. The first two days passed without any change. FIG. 7 in the orientation; the animals first attached the aboral ends of their tubes to the f
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 92 Studies in General Physiology Spirographis Spallanzanii, each about 15 cm. long, on the bottom of the aquarium, with the longitudinal axes of their tubes perpendicular to the plane of the window. Eight of them lay with their oral poles toward the room side efgh (Fig. 7) of the aquarium; one with its oral pole toward the window side. The first two days passed without any change. FIG. 7 in the orientation; the animals first attached the aboral ends of their tubes to the floor of the aquarium. In the course of the third day the tubes of six of the animals, which were placed with their oral pole toward the room side, began to bend in an almost horizontal plane, the concavity of the curv- ature being directed toward the window. The other two animals, which had likewise been placed with their heads toward the room side, first elevated the head end and then curved the tube concavely toward the window. Finally, the ninth animal, which I had placed in the aquarium with its head toward the window, raised its head a little. 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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