. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. Fig. 85.—A Four mother-segments seen from the pole of the nuclear figure (after van Beneden and Neyt, PI. VI., Fig. 16). B Longitudinal splitting' of the four mother-seg- ments into eight daugliter-segments (after van Beneden and Neyt, PI. VI., Fig. 17). —that is to say, the third stage commences (Fig. 85 B). The daughter segments thus formed separate from one another, and travel towards opposite poles. B. van Beneden (VI. 4b) and Boveri (VI. 6) consider that the spindle fibrils play
. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. Fig. 85.—A Four mother-segments seen from the pole of the nuclear figure (after van Beneden and Neyt, PI. VI., Fig. 16). B Longitudinal splitting' of the four mother-seg- ments into eight daugliter-segments (after van Beneden and Neyt, PI. VI., Fig. 17). —that is to say, the third stage commences (Fig. 85 B). The daughter segments thus formed separate from one another, and travel towards opposite poles. B. van Beneden (VI. 4b) and Boveri (VI. 6) consider that the spindle fibrils play an active part in this process. In their opinion, the spindle in Ascaris is composed of two independent portions, each of which consists of a large number of protoplasmic fibrils. These converge towards the ceutrosome and attach their ends to it, whilst the op- posite ends diverge, approach the nuclear loops, and fasten themselves at various points to the daughter-segments, which are turned towards them. These threads by gradually contracting, and thus be- coming shortened, cause, in van Beneden's and Boveri's opinion, the separation of the daughter-segments, which are thus gradually drawn towards the cen- Fig. 86.—The construction of the spindle out of two half- spindles, the fibrils of -n-hich have attached themselves to the daughter-segments. (After van Beneden and Neyt, PI. VI., Fig. 8.). 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, Oscar, 1849-1922; Campbell, M. , tr; Campbell, Henry Johnstone, 1859- ed. London, S. Sonnenschein & Co. ; New York, Macmillan & Co.
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