. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 68 FRANK R. LILLIE. to have a thick and dense wall in which the spherules of the spherular zone are especially aggregated. The intermediate spongy zone appears wider. The striking similarity of this con- / ^;v •••-.;.::,; U1 })}%$$$$&> >••••*. •'. \^i^m MiMfM^ •:rV-;x-S^, ,:-. *+•. FlG. 5. Section of an unfertilized egg of Chatopterus that stood in sea water two hours and seven minutes before killing. figuration to that produced by low centrifugal powers will be seen as the description proceeds. We may now compare
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 68 FRANK R. LILLIE. to have a thick and dense wall in which the spherules of the spherular zone are especially aggregated. The intermediate spongy zone appears wider. The striking similarity of this con- / ^;v •••-.;.::,; U1 })}%$$$$&> >••••*. •'. \^i^m MiMfM^ •:rV-;x-S^, ,:-. *+•. FlG. 5. Section of an unfertilized egg of Chatopterus that stood in sea water two hours and seven minutes before killing. figuration to that produced by low centrifugal powers will be seen as the description proceeds. We may now compare the pictures presented by eggs of this stage that have been centrifuged at different speeds : For this purpose we shall select first an egg that was centrifuged 1,150 revolutions in 31 seconds at a radius of 13 centimeters (Fig. 6). Comparison of a large number of eggs shows first that the position of the eggs in the centrifuge is a matter of chance and second that the segregation produced is essentially the same in whatever direction the centrifugal force may act with reference to the polar axis. We may therefore leave the question of direc- tion of centrifugal force out of account. As already noted, the effect on the living egg is very striking: it appears stratified in the direction of action of the centrifugal force ; at the central pole is a small gray cap, next to it a broad, clear or hyaline. 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
Size: 1621px × 1541px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
