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Page:Popular Science Monthly Volume 71.djvu/461

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AGE, GROWTH AND DEATH

THE PROBLEM OF AGE, GROWTH AND DEATH
By CHARLES SEDGWICK MINOT, LL.D., D.Sc.

JAMES STILLMAN PROFESSOR OF COMPARATIVE ANATOMY, HARVARD MEDICAL SCHOOL

V. Regeneration and Death

Ladies and Gentlemen: In the last lecture I treated the conception I had formed of the processes of regeneration and told you that I looked upon the change which occurred first in the developing germ as one of rejuvenation. The process has for its technical name the segmentation of the ovum. The appearance of this segmentation process was illustrated to you by the pictures thrown upon the screen. Cytomorphosis is a term which we have frequently used in the course

PSM V71 D461 The segmentation of the ovum of ambystoma punctatum.png

Fig. 51. The Segmentation of the Ovum of Amblystoma punctatum, to show the earliest phases of development in the egg of a newt. After A. C. Eycleshymer.