. Elementary text-book of zoology [electronic resource]. Zoology. MAMMALIA. In all three of the first series the third toe is the largest and strongest, but whilst the tapir has four toes touching the ground (in the fore limbs), the rhinoceros has three, and the horse has one. Hence the conclusion is irresistible that the tapir, haunting the soft ground of forests, has remained at the four-toed stage, whilst the rhinoceros has progressed slightly further and given up its fifth toe, and the horse, frequenting drier harder ground and moving more Fig- 313.—The Manus of (A) the Tapir; (B), the Rhi
. Elementary text-book of zoology [electronic resource]. Zoology. MAMMALIA. In all three of the first series the third toe is the largest and strongest, but whilst the tapir has four toes touching the ground (in the fore limbs), the rhinoceros has three, and the horse has one. Hence the conclusion is irresistible that the tapir, haunting the soft ground of forests, has remained at the four-toed stage, whilst the rhinoceros has progressed slightly further and given up its fifth toe, and the horse, frequenting drier harder ground and moving more Fig- 313.—The Manus of (A) the Tapir; (B), the Rhinoceros AND (C) THE Horse. (After Flower.). A B C Note the alternate carpal bones and the predominant third digit in each, but the gradual reduction in the other digits. rapidly, has lost all but the third or middle toe. The same lesson is taught by the other series in which the third and fourth toes are of equal size. Here the pig has four toes, all touching the ground, though the second and fifth are smaller and shorter than the others. The chevrotain and ox show a further reduction of these two toes, and the camel (in this respect the last of the series) has lost all trace of them and has only the third and fourth. (See Fig. 344.). 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 Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
