. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FuETHEE Investigations on Helioteopism 93 Within tlie next few days the six first-mentioned animals further elevated their heads, so that the animals on Decem- ber 22—eight days after being placed in the aquarium— were all similarly oriented toward the light. The head was directed toward the window, and the axis of symmetry of the gills which were exposed to the light lay in the direction of the more intense rays of daylight which entered from. fig. 8 without and above. I
. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FuETHEE Investigations on Helioteopism 93 Within tlie next few days the six first-mentioned animals further elevated their heads, so that the animals on Decem- ber 22—eight days after being placed in the aquarium— were all similarly oriented toward the light. The head was directed toward the window, and the axis of symmetry of the gills which were exposed to the light lay in the direction of the more intense rays of daylight which entered from. fig. 8 without and above. I waited to discover whether this orien- tation would last. The aquarium remained undisturbed until February 16, 1890 ; that is, for more than two months. The animals also did not change their positions, as indicated in Fig. 7. 3. On the afternoon of February 17, 1890, the aquarium was turned 180° about its vertical axis, and the zinc box was again inverted over the aquarium so that the movable end was directed toward the window. By turning the aquarium around in this way, the heads of the animals, which had been until then directed toward the source of light, were suddenly turned toward the room side of 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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