viii Contents 



PAGE 



The changing incidence of certain vascular lesions of the 

 skin with ageing 



by W. B. Bean . 80 



J Ageing of elastic tissue and the systemic effects of elastase 



by A. I. Lansing ....... 88 



Discussion: Albertini, Aub, Comfort, Cowdry, Lansing, 

 McCance, Medawar, Tunbridge, Verzar . . . 108 



Calcium metabolism in old age as related to ageing of the 

 skeleton 



by O. J. Malm, R. Nicolaysen and L. Skjelkvai.e . 109 



Discussion: Aub, Brull, McCay, Nicolaysen, Tunbridge . 123 



17-Ketosteroid excretion in ageing subjects 



by Betty L. Rubin, R. I. Dorfman, and G. Pincus . 126 



Discussion: Comf'Ort, Freeman, Krohn, Lewis, Medawar, 

 MiEscHER, Olbrich, Parkes, Rubin, Shock, Tunbridge 137 



Tissue transplantation technique applied to the problem 

 of the ageing of the organs of reproduction 



by P. L. Krohn ........ 141 



Preservation of tissue in vitro for the study of ageing 



by A. S. Parkes 162 



Discussion: Bean, Comfort, Cowdry, Krohn, Medawar, 

 Parkes, Verzar . . . . . . . .169 



Research areas in gerontology nutrition that are nov^ 

 neglected 



by C. M. McCay 173 



A fantasy of ageing and the bearing of nutrition upon it 



by R. a. McCance and E. M. Widdowson . . .186 



Too rapid maturation in children as a cause of ageing 



by H. M. Sinclair 194 



Discussion: Aub, Bartlett, Brltll, Comfort, Cowdry, 

 Franklin, Krohn, Lansing, McCance, McCay, Medawar, 

 MiESCHER, Nicolaysen, Olbrich, Parkes, Shock, Sinclair, 

 Tunbridge, Verzar ....... 201 



