. Text-book of zoology for junior students. Zoology. INTEODUCTIOX. 9 arbitrary, and that the groups of functions run into one another, and are most intimately connected. Tlius, fur exaniijle, in tlie higher ani- mals, some or all of the functions of relation are secondarily func- tions of nutrition, and vice versa, since the integrity of both groups is essential to the working of either. If the animal be deprived of the powers of vision and locomotion, it cannot obtain food ; and if its nutrition be interfered with, its functions of relation will be destroyed. Homology and Axalogy.—These are t
. Text-book of zoology for junior students. Zoology. INTEODUCTIOX. 9 arbitrary, and that the groups of functions run into one another, and are most intimately connected. Tlius, fur exaniijle, in tlie higher ani- mals, some or all of the functions of relation are secondarily func- tions of nutrition, and vice versa, since the integrity of both groups is essential to the working of either. If the animal be deprived of the powers of vision and locomotion, it cannot obtain food ; and if its nutrition be interfered with, its functions of relation will be destroyed. Homology and Axalogy.—These are two terms which are em- ployed to express, respectively, the morphological and physiological likenesses between the organs and parts of different animals. When we find the same morphological structure or organ in two different' animals, however much altered or disguised in form, then we have to deal with a case of homoloc/i/; the two organs are homol- ogous ; and the one is said to be the Jtomologue of the other. And. 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 Nicholson, Henry Alleyne, 1844-1899. New York, American Book Co
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