Bulletin of the American Museum of Natural History Volume 30

Bulletin of the American Museum of Natural History Volume 30

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...less conspicuous color than the coats of the second four. The countershading on a wildebeest, which shows dark against the green or brown or yellowish plains, had, not merely practically, but absolutely, no effect whatever in rendering it invisible, for it could be seen as far as a black tree stump, for instance, could beseen. Among leafless bushes and small thickets, and clumps of tall dried grass, an oryx or roan or buck Grant might, if motionless, for a short time escape the notice of untrained eyes, not because of the countershading, but simply because in the flood of bright sunlight, the light, washed-out color of the surrounding objects prevented any vivid contrast and made the eye hesitate in picking out the motionless antelope from its accidented, motionless, shaded and lighted, not very differently colored, surroundings, although these surroundings were solid objects. In other words, the reason for even this partial invisibility was the direct reverse of what Mr. Thayer claims; it was not in the least because the animals were countershaded, for if their general color was in contrast to that of their surroundings they stood out in bold relief; it was simply because the eye was inattentive to individual objects in the multiplicity of objects, the effects of light and shade being practically the same on the buck and its surroundings, so that among the rocks and bushes and grass clumps and small euphorbias, the body of the buck was not readily picked out. It was chiefly to my own eyes, however, that the trouble was due; the native hunters who were with me could usually pick out the animal at once if within any reasonable distance. Doubtless the same is true of a beast of prey, for evidently none of these antelope, even when they...show more

Product details

  • Paperback
  • 189 x 246 x 9mm | 295g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236885449
  • 9781236885449