File:The Biological bulletin (19754135213).jpg

Title: The Biological bulletin
Identifier: biologicalbullet106mari (find matches)
Year: [1] (s)
Authors: 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
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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52 JOHN K. HARRISON AND IRYIXC KLEIN and six blastoderms incubated for 2 to 18 hours at the high temperature had an average hourly increase of 0.3016 mm. In this comparison only growth of the low temperature blastoderms during the first nine days was considered, since it is felt that the increase from the ninth to tenth day is not true growth, rather an increase in diameter resulting from degenerative spreading. ANIDIAN AND DEGENERATE STREAK PRODUCTION AT 25° C. 100
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14 15 ANIDIANS U NORMALS FIGURE 2 DEGENERATE There is a corresponding slowed differentiation of primitive streaks in blasto- derms incubated at the low temperature. Primitive streaks, as distinguished from the more diffuse primitive shields, first appear in blastoderms incubated at the low temperature after forty-eight hours of incubation. At the high temperature, primi- tive streaks first appear after four hours of incubation. The ratio of development, as measured by streak appearance, between blastoderms incubated at the high tern-

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