The Annals and Magazine of Natural History (Volume 14, Nos. 88-94 ); Zoology, Botany, and Geology by Books Group
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Author: Books Group
Number of Pages: 236 pages
Published Date: 13 Jan 2012
Publisher: General Books
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781234985936
File Name: The.Annals.and.Magazine.of.Natural.History.(Volume.14,.Nos..88-94.);.Zoology,.Botany,.and.Geology.pdf
Download Link: The Annals and Magazine of Natural History (Volume 14, Nos. 88-94 ); Zoology, Botany, and Geology
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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1844. Not illustrated. Excerpt: ... LVII.-- On the Antheridia and Spores of some species 0/Fucus. By MM. J. Decaisne and Gustave Thuret*. The existence of sexes in the Algae having been admitted, in our opinion, in the commencement of the last century, from incomplete observations, we went to the coast of the British Channel, with a view to throw some light upon this obscure point of science. Having met with various new facts in the course of our observations, we shall point out in a few words the principal results of our researches. Our investigations were principally made on Funis serratus, vesiculosus, nodosus and canaliculatus. The first two appeared to us dioecious; the two others monoecious. The conceptacles, in the male individuals, are filled with articulated filaments, which bear numerous antheridia in the form of vesicles containing red granules. These antheridia are expelled by the orifice of the conceptacles; if we examine them with the microscope, we see issue from one of their extremities transparent corpuscles nearly pear-shaped, each one inclosing a single red globule; each one of these corpuscles is furnished with two very thin cilia, by means of which it moves with extreme vivacity. The analogy of these corpuscles with what have been called the spermatic animalcules of Chara, the Mosses and the Liverworts, is very remarkable. In Chara, as in the Mosses, in Marchantia, Targionia, and the Jungermannite, one of us has ascertained the presence of the two locomotive cilia, inserted toward the extremity of a filiform body commonly wound spirally. According to these observations, from the promptitude with which the corpuscles of the Fucus decompose and form, at the bottom of the vessel in which they are placed, a layer of inert granules which soon completely disappear, we think we are ...
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