Proceedings of the Royal Society of Victoria Volume 8-9

Proceedings of the Royal Society of Victoria Volume 8-9

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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. 1896 edition. Excerpt: ...the Ratitze are invariably over 40. The temperature of thirty-six fowls, taken quietly by night from their perches, averaged 41 exactly, while that of twelve, lifted from the nests in which they were brooding, was 41-4. Numbers of fowls caught while roaming about averaged 41-3, but these of course were always warmed up previously by a little violent exercise. Turkeys stand about the same level; ducks are stated, on good authority, to be lower; but I have found for these birds, from a fairly large number of observations, an average of 42-1. The temperatures of birds of the more intelligent orders is generally somewhat higher. If we exclude the birds of prey, we might say that in all orders above the anseres, grallae and gallinse the temperature ranges over 42. It would be a matter of interest to secure some observations of the temperature of the apteryx, in order to determine whether the lowest of birds shows by its body warmth in some degree the same reptilian aflinity which the monotremes exhibit. In that case. there would be reason to believe that the rest of the Ratitae would correspond closely to the Marsupials, being a connecting link, but much closer to the higher forms than to the lower. In a very general way, and not forgetting numerous limitations and contradictions, it may be said that bodily activity depends on body temperatures, that creatures such as insects, and reptiles are active only when warmed up from without, but become torpid with decreasing temperature. The type in which activity is generally habitual, maintains its own body temperature. This is 2 5.4 5 To shaw 11/uvmzfance U/zfier Line seen in the mammals, but more still in the birds. But this warmblooded active condition was produced by no more

Product details

  • Paperback
  • 189 x 246 x 8mm | 290g
  • English
  • Illustrations, black and white
  • 1236865510
  • 9781236865519