Transactions of the Linnean Society Volume 18

Transactions of the Linnean Society Volume 18

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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. 1841 edition. Excerpt: ... transparent balls, which altogether resemble their gravid parents; they swam and moved about with greater power and vigour; and their more active and busy movements struck me as if they were under a more decidedly spontaneous control or influence. Rmsel's figures above referred to are accurate--J. H., May 16, 1839. One of these bodies I likewise put by itself in a watch-glass containing a little water, which I placed on the stage of the microscope for the purpose of continuing to witness with that instrument more minutely its process of development; the water being changed two or three times a day, the germlike body at first moved a good deal about the glass; it then began to keep nearly in the same place, only turning gently round as if on itslaxis; becoming afterwards stationary, it fixed itself to the glass, and changed into a small spot of a white opake substance; which, while growing in the Water, appeared under the microscope to be solely gelatinous, but when it had been dried for a day or two, minute cells and fibres or spicula were manifest. At this time I was repeating the experiment of growing the Spongilla from its seedlike sporidia or sporules, as I had only imperfectly done so in the preceding March. Having taken many of these fresh seedlike bodies from their fixed localities in the cells or pores of the Sponge, I deposited them in a china dish nearly filled with water, which I renewed twice a day. I was most attentive in examining not only with my naked eye, but also with a powerful lens, whether these bodies possessed any spontaneous motions, but could not discover the least appearance of any; on the contrary, the instant they were put into the water they sunk to the bottom of the dish; there remaining motionless, ...show more

Product details

  • Paperback | 250 pages
  • 189 x 246 x 13mm | 454g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236812352
  • 9781236812353