. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 256 A I,I,AX C. SCOTT \ 72 '/ 73. -A-' »• •» 77 78 79 8O FIGURES 71-80. Photographs illustrating operations VII, IX, and X. Operation VII. Case I, Figures 71-73, slits lateral to the spindle; five furrows form four cells, two with aster and nucleus and two without. Operation IX, Figures 74-77, isolation of tubes of late furrow cortex followed by shrinkage of the tubes. Operation X, Figures 78-80, isolation of tubes of early furrow cortex followed by shrinkage of the tubes. by a number of different operations (rf. Fig. 18 and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 256 A I,I,AX C. SCOTT \ 72 '/ 73. -A-' »• •» 77 78 79 8O FIGURES 71-80. Photographs illustrating operations VII, IX, and X. Operation VII. Case I, Figures 71-73, slits lateral to the spindle; five furrows form four cells, two with aster and nucleus and two without. Operation IX, Figures 74-77, isolation of tubes of late furrow cortex followed by shrinkage of the tubes. Operation X, Figures 78-80, isolation of tubes of early furrow cortex followed by shrinkage of the tubes. by a number of different operations (rf. Fig. 18 and Fig. 59), after which only narrow connections joined the tubes to the main mass of the egg, and in all cases the tubes diminished in diameter in the manner of a cleavage stalk. Such phe- nomena are difficult to explain by the membrane expansion theory (Mitchison, 1952; Swarm, 1952) which hypothesizes that the expansion of non-furrow surface causes the shrinkages of the furrow. In our experiments furrow cortex is nearly- separated from the non-furrow surface, yet it shrinks very effectively. One could argue that the expansion process reaches into the furrow itself but this view must be discarded, as Swann and Mitchison (1958) have pointed out, because there is no area of expansion in the furrow (Dan and Ono, 1954).. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
