. A manual of zoology. Zoology. 72 GENERAL PRINCIPLES OF ZOOLOGY germinal vesicle always occurs in the egg. Its contents are mainly the nuclear fluid, ihrough which is distributed an achromatic network, and in addition the nucleolus (germinal spot). The Spermatozoa, the morphological elements of the male reproductive product, are so small that their liner structure can be studied only with the strongest powers of the microscope (lig. 37, I and II). Easiest to rec-. ognize is the head, wh'ch from its form—spherical, oval, sickle-shaped, etc.—often renders possible the speciiic determination of
. A manual of zoology. Zoology. 72 GENERAL PRINCIPLES OF ZOOLOGY germinal vesicle always occurs in the egg. Its contents are mainly the nuclear fluid, ihrough which is distributed an achromatic network, and in addition the nucleolus (germinal spot). The Spermatozoa, the morphological elements of the male reproductive product, are so small that their liner structure can be studied only with the strongest powers of the microscope (lig. 37, I and II). Easiest to rec-. ognize is the head, wh'ch from its form—spherical, oval, sickle-shaped, etc.—often renders possible the speciiic determination of the spermatozoa. The head (2) is the closely compacted chromatic part of the nucleus, and hence colors very deeply in staining fluids. Often the head is continued in front as a sharp point, the pcrforaioriiim (t), which is apparently adapted to aid in the penetration of the egg in fertilization. Next comes. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
