Biological Approach in Study of Ageing 19 



VRicker, W. E. (1948). Indiana Univ. Publ. (Sci.), 15. 

 Rogers, J. B. (1950). Anat. Rec, 106, 286. 

 Rudzinska, M. A. (1952). J. Geront., 7, 544. 

 Rudzinska, M. A. (1955). J. Geront., 10, 469. 

 Smith, M. (1951). The British Amphibians and Reptiles. London: 



Collins. 

 Sumner, F. B. (1922). J. Mammal, 3, 79. 



[Discussion of this paper was postponed until after the paper by 

 Prof. Bourliere. — Eds.] 



