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This Fifteenth Symposium of the Society for the Study of Development and Growth is divided into three parts. In the first group of chapters T. T. Puck discusses the methods of deriving cultures from single animal cells; R. Dulbecco, problems of virus reproduction; and R. M. Klein, the current status of cultivating plant tissues. D. M. Prescott then examines the rhythmic growth and division of Amoebae; C. S. Pittendrigh and V. G. Bruce contribute a review of their analysis of internal clocks in animals; and E. Bunning writes on diurnal rhythms in vascular plants. Finally H. Gaffron and B. L. Strehler discuss the origin, significance and mechanics of photosynthesis while H. F. Blum and H. Shapley take up other aspects of biochemical evolution.

Originally published in 1957.

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