A Fantasy on Ageing 193 



but natural protection, environment and heredity must all 

 enter into the picture. The type of over nutrition must also 

 matter, and if there is any truth in our speculations about 

 kwashiorkor and alcohol it may be possible to have the cells 

 of one organ dying of overnutrition while the animal as a 

 whole is suffering from undernutrition. It is admitted frankly 

 that these ideas are speculations rather than theories and 

 that even if they are true they are generalizations of the 

 broadest type and tliere is clearly an immense amount of 

 detailed information to be obtained and integrated with them. 

 This will take time, and we may not live long enough to see 

 it accomplished. If, however, we have provided you with 

 twenty minutes' entertainment and given you something to 

 think about, this is all we can honestly say that we set out to 

 do. 



REFERENCES 



Bracket, J. (1945). Nature, Lond., 173. 725, 



Brody, S. (1945). Bioenergetics and Growth. New York: Reinhold 



Publishing Corp. 

 Davidson, J. N., and Waymouth, C. (1944). Biochem. J., 38, 379. 

 Davies, B. M. a., and Yudkin, J. (1952). Biochem. J., 52, 407. 

 Droop, M. R. (1954). Nature, Lond., 173, 435. 

 Editorial (1954). Brit. med. J., i, 973. 

 Fogg, G. E. (1953). The metabolism of algae. Monographs on Biological 



Subjects. London: Methuen. 

 Gale, E. F., and Folkes, J. P. (1954). Nature, Lond., 173, 1223. 

 Hammond, J. (1952). Farm Animals: their breeding, growth and 



inheritance. 2nd Ed. London: Edward Arnold & Co. 

 Harrison, M. F. (1953). Biochem. J., 55, 204. 

 Kennedy, G. C. (1950). Proc. roy. Soc. B. 137, 535. 

 Kennedy, G. C. (1951). Proc. R. Soc. Med., 44, 899. 

 Kennedy, G. C. (1952). Proc. roy. Soc. B. 140, 578. 

 LiENER, I. E., and Schultze, M. O. (1950). J. biol. Chem., 187, 743. 

 Lilly, D. M. (1953). Ann. N.Y. Acad.^ci., 56 (5) 910. 

 McCance, R. A. (1953). Lancet, ii, 685. 

 McCay, C. M. (1952). Cowdry's "Problems of Ageing" 3rd Ed. edited 



by Lansing, A. I. Baltimore: Williams and Wilkins Co. 

 McCay, C. M., Maynard, L. A., Sperling, G., and Barnes, L. L. 



(1939). J. Nutr., 18, 1. 

 Newman, E. A., and Grossman, M. I. (1951). Ainer. J. Physiol., 164, 



251. 

 RuDZiNSKA, M. A. (1953). Ann. N.Y. Acad. Sci., 56, (5) 1087. 

 Silberberg, M., and Silberberg, R. (1954). Amer. J. Physiol, 111, 23. 



