Report of the Board of Regents Volume 26

Report of the Board of Regents Volume 26

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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. 1873 edition. Excerpt: ...in hand. We will constantly endeavor, as far as in us lies, to labor in this great cause. ALTERNATE GENERATION AND PARTHENOGENESIS IN THE ANIMAL KINGDOM. Lecture delivered before tho Vienna Society for the Diffusion of Scientific Knowledge, by Dr. G. A. Koknhl'ber. Translated for the Smithsonian Institution. Among the various questions whose scientific explanation is the province of animal physiology, none has perhaps excited the interest of the people, as well as of scholars, to a higher degree than the propagation of organisms. While in former times naturalists entertained the most various opinions and hypotheses, or indulged in the most chimerical speculations, modern science, armed with more perfect knowledge and greatly improved instruments, and more familiar with methods of exact research, has gradually succeeded in shedding some light on these mysterious processes. These processes in general consist in this, that certain bodily constituents are from time to time separated from individual beings, and are developed into others of the same species. If the action of a second animal substance is necessary on such separated germs, which then show the characteristic structure of eggs, and are called ova, the process is called sexual propagation or generation; but if the germ under favorable external circumstances may become a new being without such action, this more simple though less general process is called unsexual or agamic reproduction. To the latter belongs a series of phenomena to which I have the honor of directing your attention this evening; phenomena which have been accurately studied and verified only within the last two decades. A law has been established of the highest importance, not only to zoology but to all natural...show more

Product details

  • Paperback | 200 pages
  • 189 x 246 x 11mm | 367g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236751809
  • 9781236751805