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. 1922 edition. Excerpt: ... centroaome; h, 'head' consisting of the nucleus surrounded by a cytoplasmic envelope; m, ne, middle piece; I, tail or flagellum. (After Ketzius.) B in most cases by active lashing of its flagellum. This necessitates a fluid medium in which the sperm can swim, and such is provided by the environment in which ...
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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. 1922 edition. Excerpt: ... centroaome; h, 'head' consisting of the nucleus surrounded by a cytoplasmic envelope; m, ne, middle piece; I, tail or flagellum. (After Ketzius.) B in most cases by active lashing of its flagellum. This necessitates a fluid medium in which the sperm can swim, and such is provided by the environment in which the organism lives or, in the case of most higher animals, where fertilization takes place within the oviduct, by special fluids secreted for the purpose. In the highest plants, however, it will be recalled that the characteristic motility of the sperm is lost in the excessive specialization attendant upon gametophyte reduction--the sperm nucleus reaching the egg by the growth of the pollen tube down through the tissues of the style. A question of much interest is how the actual meeting of the gametes is brought about. In many cases it is undoubtedly merely by chance; the random swimming of the sperm sooner or later bringing one in contact with an egg. In other cases the movements of the sperm seem to indicate some definite attraction by the egg. It has been shown, for example, that the sperm of some Mosses and Ferns are attracted by exceedingly dilute solutions of cane sugar and malic acid respectively, traces of which are secreted by the tissues in the vicinity of the egg. Also the sperm of some of the lower animals are attracted by substances eliminated by the egg during maturation. In such instances there can be but little doubt that chemical stimulation of the sperm by specific substances plays a part in bringing the gametes together. This is an example of Chemotaxis: a phenomenon of considerable importance, especially in the behavior of free-living cells. Once a single sperm has come into functional contact with the egg, it initiates a...
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Add this copy of Foundations of biology to cart. $9.75, good condition, Sold by Tehanu's Books rated 4.0 out of 5 stars, ships from Gilroy, CA, UNITED STATES, published 1936 by The Macmillan company.
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Seller's Description:
Good. No dust jacket. Some rubbing on cover, slightly bumped edges, pages tanned, small (1/2") liquid stain on bottom edge of middle 200 pages. xiv, 583 p. front., illus. (1 col. ) diagrs. 23 cm. Includes index and bibliography. Hunter green cloth over boards, gold printing on spine (faded) and cover.
Add this copy of Foundations of Biology to cart. $10.00, good condition, Sold by Richard Burlew rated 4.0 out of 5 stars, ships from Trumansburg, NY, UNITED STATES, published 1927 by MacMillan Co..
Add this copy of Foundations of Biology to cart. $13.88, fair condition, Sold by Victoria Bookshop rated 4.0 out of 5 stars, ships from Bere Alston, DEVON, UNITED KINGDOM, published 1931 by Macmillan 1931.
Add this copy of Foundations of Biology to cart. $15.00, good condition, Sold by Richard Burlew rated 4.0 out of 5 stars, ships from Trumansburg, NY, UNITED STATES, published 1941 by The Macmillan Co.
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Seller's Description:
B&W drawings. Good. No Jacket. Book is tight and clean with no underlining or markings; book seller price stamped inside front board; blue boards show minimal wear and very light handling soil.
Add this copy of Foundations of Biology to cart. $18.00, very good condition, Sold by Between the Covers-Rare Books rated 5.0 out of 5 stars, ships from Gloucester City, NJ, UNITED STATES, published 1936 by The MacMillan Co.
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Seller's Description:
Very Good. Fifth edition. Very good: Name in pen on end pg, bumping of corners/ends, foxing. Please Note: This book has been transferred to Between the Covers from another database and might not be described to our usual standards. Please inquire for more detailed condition information.
Add this copy of Foundations of Biology to cart. $29.95, very good condition, Sold by Sequitur Books rated 5.0 out of 5 stars, ships from Boonsboro, MD, UNITED STATES, published 1927 by MacMillan.
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Seller's Description:
Very Good. Size: 0x0x0; [Fundamental Principles of Biology] Bound in blue cloth. Hardcover. Good binding and cover. Shelf wear. Foxing to edges. Owner's names on front end pages. xxiii, 546 p., ill., 20 cm.
Add this copy of Foundations of Biology to cart. $67.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
