Nature Volume 57

Nature Volume 57

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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. 1898 edition. Excerpt: ... described as new species, though the author has endeavoured to refer them to existing forms which have become modified by environment. Most of these cave inhabitants are characterised by the extraordinary development of their tactile and auditory organs, their antennoe, legs, ' and even their bodies being covered with fine hairs highly sensitive to the slightest disturbance. In searching for transitional types, M. Vire has met with a fair measure of success. In the case of Asellus aijuaticus, both normal and subterranean forms exist, the latter presenting marked differences in their antennules. The author considers that the subterranean genus of beetles, Anophthalmia, is probably referable to Trechus, and that the new species, Niphargus virei, is possibly a modified form of Gammarus. Finally, M. Vire suggests the desirability of an extended series of experiments on these transitional forms, with a view of ascertaining how far they tend to revert to the normal types on being restored to light. The transformation of Rontgen rays by metals forms the subject of a note contributed to the Societe Francaise de Physique, by M. G. Sagnac (Bulletin, No. 106). When such rays are incident on a metal surface they are not perceptibly reflected, but the superficial layer transforms them into secondary rays capable of producing photographic impressions, of exciting fluorescent screens, or of discharging electrification. These secondary rays differ from ordinary Rontgen rays in that they are freely absorbed by aluminium, the absorption giving rise to a further kind of tertiary rays, still more readily absorbed by aluminium. M. Sagnac suggests that the secondary and tertiary rays may be intermediate between true Rontgen and Lenard rays. An important memoir...
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Product details

  • Paperback | 850 pages
  • 189 x 246 x 43mm | 1,488g
  • United States
  • English
  • black & white illustrations
  • 1236858727
  • 9781236858726