. The cell in development and inheritance. Cells. UNION OF THE GERM-CELLS 197 dence of a definite attraction between the germ-cells, which is in some cases so marked (for example in the polyp Renilla) that when spermatozoa and ova are mixed in a small vessel, each ovum becomes in a few moments surrounded by a dense fringe of sperma- tozoa attached to its periphery by their heads and by their move- ments actually causing the ovum to move about. The nature of the attraction is not positively known, but Pfeffer's researches on the spermatozoids of plants leave little doubt that it is of a chemica
. The cell in development and inheritance. Cells. UNION OF THE GERM-CELLS 197 dence of a definite attraction between the germ-cells, which is in some cases so marked (for example in the polyp Renilla) that when spermatozoa and ova are mixed in a small vessel, each ovum becomes in a few moments surrounded by a dense fringe of sperma- tozoa attached to its periphery by their heads and by their move- ments actually causing the ovum to move about. The nature of the attraction is not positively known, but Pfeffer's researches on the spermatozoids of plants leave little doubt that it is of a chemical nature, since he found the spermatozoids of ferns and of Selaginella to be as actively attracted by solutions of malic acid or malates (con- tained in capillary tubes) as by the substance extruded from the I —. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York, Macmillan
Size: 1883px × 1327px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911
