. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. Embryology. 123 Moreover this membrane, when present, is usually provided with one or more minute apertures, through which the spermatozoon passes when fertihzing the ovum. It is remarkable that the spermatozoa know, so to speak, of the existence of these gate-ways,— their snake-like movements being directed towards. Fig. 32.—Human ovum, mature and greatly magnified. (After them, presumably by a stimulus due to some emana- tion therefrom^ In tlie mammali
. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. Embryology. 123 Moreover this membrane, when present, is usually provided with one or more minute apertures, through which the spermatozoon passes when fertihzing the ovum. It is remarkable that the spermatozoa know, so to speak, of the existence of these gate-ways,— their snake-like movements being directed towards. Fig. 32.—Human ovum, mature and greatly magnified. (After them, presumably by a stimulus due to some emana- tion therefrom^ In tlie mammalian ovum, however, these apertures are exceedingly minute, and distributed ' The spermatozooids of certain plants can be strongly attracted towards a pipette which is filled with malic acid—crowding around and into it with 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 Romanes, George John, 1848-1894. Chicago The Open Court Pub. Co
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