The Austin Electric Railway System Volume 9-24

The Austin Electric Railway System Volume 9-24

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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. 1906 edition. Excerpt: ...during a cold period are always stiff and apparently lifeless; the body color is very dark and uniform in distribution. Specimens in exposed positions retain this dark coloration during periods of cold even though they may be exposed to bright sunlight, showing conclusively, it would seem, that the changes in form of the chromatophores are influenced more strongly by temperature than by light. The reappearance of the lizards after a period of cold is a gradual one, those in the most exposed locations being the first to feel the sun's warmth, and those in the least exposed places waiting until the warmth can penetrate their retreats. The habit of seeking seclusion during periods of cold and consequent inactivity and helplessness, undoubtedly serves also as a means of protection, for the same conditions that would furnish protection from cold would be equally efficient in furnishing a hiding place from enemies at a time when protection is most needed. Although the temperature element in climate is the most important in its effects on behavior, the elements of sunlight, wind and rain must not be ignored. Sunlight, apart from its obvious necessity for vision. seems to serve chiefly as a guide in the search of warmth, the hest lighted situations being as a rule the warmest. There is little doubt but that the lizard, in its daily round of temperature reactions, is' guided largely by sunlight.. The most brightly illuminated parts of the tree trunks and branches no doubt serve as objective points for the lizard seeking the warmest basking place. The chromatophores seem to act more directly to the light than to temperature, but in reality, as has been shown by experiment, temperature is the chief controlling factor in the color changes of more

Product details

  • Paperback | 230 pages
  • 189 x 246 x 12mm | 417g
  • United States
  • English
  • black & white illustrations
  • 1236752112
  • 9781236752116