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Home > Art, Film & Photography > Year Book Volume 7
Year Book Volume 7

Year Book Volume 7


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...Mr. Wallace labored very assiduously over these studies, and it is surprising that he should have found so many species in a tropical region, for it has been generally assumed that the tropics are poorly endowed with littoral species of Hydroidea. Alfred G. Mayer discovered that pulsation in Scyphomedusae is caused by the constant formation of sodium oxalate in the marginal sense-organs. This sodium oxalate precipitates calcium, and thus sets free sodium chloride, which acts as a nervous stimulant. Pulsation is thus due to the constant maintenance of a slight excess of common salt in the sense-organs, over and above the concentration found in the surrounding sea-water. Moreover, the sea-water itself is a balanced fluid neither inhibiting nor stimulating pulsation. The sodium chloride of the sea-water is both a muscular and nervous stimulant, but the magnesium, calcium, and potassium are inhibitors and exactly counterbalance the effect of the sodium, producing a neutral fluid, thus permitting the weak internal stimulus of a slight excess of sodium chloride produced in the sense-organs to maintain the rhythmical pulsation. The Atlantic palolo worm swarmed at Tortugas on the mornings of July 10 and 19, 1908; the first quarter of the moon being on July 6 and the last on July 19. Worms swarmed normally on July 19 out of rocks which had been maintained in the tideless water of a floating live-car for 6 weeks previous to the day of the swarming. The writing of a description of all of the Scyphomedusae of the world has been completed, this being the second volume of a work upon the "Medusae of the World," the first volume of which is now going through the press. PRELIMINARY REPORTS OF RESEARCHES, SEASON OF 1908. Preliminary Report upon the Reactions of Br...


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Product Details
  • ISBN-13: 9781236029607
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 106
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1236029607
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 204 gr


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