The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . werepermanently joined together. So in the minds ofmen often two ideas lie side by side which ought tobe married to one another, and there is no one readyso dull is the owner of the mind, to pronounce thesacramental words which shall join them, and the rite ^ The hypothesis that the increase of protoplasm is the cause of old age wasoriginally put forward in 1890(0. S. Minot, On Certain Phenomena of Grow-ing Old, P)-oc. American Assoc. Adv. Science, xxix., Address of the Vice
The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . werepermanently joined together. So in the minds ofmen often two ideas lie side by side which ought tobe married to one another, and there is no one readyso dull is the owner of the mind, to pronounce thesacramental words which shall join them, and the rite ^ The hypothesis that the increase of protoplasm is the cause of old age wasoriginally put forward in 1890(0. S. Minot, On Certain Phenomena of Grow-ing Old, P)-oc. American Assoc. Adv. Science, xxix., Address of the Vice-President, Section F). l62 AGE, GROWTH, AND DEATH long remains unperformed, and when at last suchneighbour ideas, which naturally should be united inclose companionship, are brought together and made,as it were, into one, we are astonished that the in-evitableness of the union had not obtained our noticebefore, it is so very obvious. And so in regard to theconception of what constitutes the restoration of theyoung state, I have only this excuse to offer, which Ihave indicated to you, that even the natural thought. Fig. 58. Tarsius spectabile. Sections of Three Ova in very Early , before cleavage; 2, cleavage into four cells; 3, multicellular stage. fails to occur to us. We are very dull even if we arescientific. The pictures now before you represent certain earlystages in the progress of development of a mammalby the name of Tarsius, a creature related to the le-murs. The various figures illustrate the multiplica-tion of the cells. That which I wish to call yourattention to can be well demonstrated by the com-parison of the first figure, in which there is a single DIFFERENTIATION AND REJUVENATION 163 nucleus, with the figure on the right having a numberof nuclei. Both figures represent the very earlieststages of development and show the full size of thewhole germ, which is about the same in the two total amount of living material has not changedessentially,
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