. Animal life and intelligence. Biology; Animal intelligence; Psychology, Comparative; Evolution. 270 Animal Life and Intelligence. That we have such a sense of rotation has been proved experimentally.* Let a man, blindfolded, sit on a smooth- running turn-table. When it begins to rotate he feels that he is being moved round, but if the rotation be continued at the same rate, this feeling quickly dies away. If the rotation be increased, he again feels as if he were being moved round, but this again soon dies away. Further in- crease gives a fresh sensation, which in turn subsides, and the man
. Animal life and intelligence. Biology; Animal intelligence; Psychology, Comparative; Evolution. 270 Animal Life and Intelligence. That we have such a sense of rotation has been proved experimentally.* Let a man, blindfolded, sit on a smooth- running turn-table. When it begins to rotate he feels that he is being moved round, but if the rotation be continued at the same rate, this feeling quickly dies away. If the rotation be increased, he again feels as if he were being moved round, but this again soon dies away. Further in- crease gives a fresh sensation, which in turn subsides, and the man may then be spinning round rapidly, and be per- fectly unconscious of the fact. He is only aware that he has been gently turned round a little two or three times. Now let the speed of rotation be slackened. He has a sensation of being gently turned round a little in the opposite direction. Each time the speed is lessened he has this sense of being turned the reverse way. From these experiments we see that what we are conscious of is change of rate of rotation, or, in technical language, acceleration, positive or negative. From Professor Crum Brown's paper in Nature I tran- scribe, with some verbal modifications, his account of how the semicircular canals enable us to feel these changes of sc. 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 Morgan, C. Lloyd (Conwy Lloyd), 1852-1936. Boston, Ginn
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