. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANIMALS 229 move synchronously in the socket and that both eyes are directed at the object of vision. If there is an unbalance between the mem- bers of any pair of these muscles, that eye will be out of symmetry with its fellow, either a crossed or a wall-eye. Correction may be made by the use of lenses, or by operation to correct the difference in tension between the muscles. The Ear of Vertebrates. The sense of hearing is essentially a sensitivity to vibrations of certain freq
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. MULTICELLULAR ANIMALS 229 move synchronously in the socket and that both eyes are directed at the object of vision. If there is an unbalance between the mem- bers of any pair of these muscles, that eye will be out of symmetry with its fellow, either a crossed or a wall-eye. Correction may be made by the use of lenses, or by operation to correct the difference in tension between the muscles. The Ear of Vertebrates. The sense of hearing is essentially a sensitivity to vibrations of certain frequencies. Many of the simple animals are sensitive to sound frequencies, but whether their re-. EDG€ OF ^v.^^y- UMBRELLA -^^ry^h SENSE ORGAN. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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