X Contents 



PAGE 



Relation of lifespan to brain weight and body weight in 

 mammals / 



by G. A. Sacher 115 ^ 



Discussion : Berg, Bourliere, Comfort, Danielli, Holt, Lin- 



DOP, NiGRELLI, ROTBLAT, SaCHER, SmITH, VeRZAR, WiGGLES- 

 WORTH ......... 133 



A review of the lifespans and mortality rates offish in nature 

 and their relation to growth and other physiological charac- 

 teristics 



by R. J. H. Beverton and S. J. Holt .... 142 



Discussion: Beverton, Comfort, Danielli, Gerking, Holt, 



NiGRELLI, ROCKSTEIN, ROTBLAT ..... 177 



Physiological changes accompanying ageing in fishes / 



by S. D. Gerking 181 ^ 



Discussion: Comfort, Danielli, Gerking, Holt, Nigrelli, 



RocKSTEiN, Rotblat ....... 208 



Longevity of fishes in captivity with special reference to 

 those kept in the New York Aquarium 



by R. F. NiGRELLI 212 



Discussion: Beverton, Bourliere, Comfort, Danielli, 



Gerking, Holt, Nigrelli, Rockstein, Scheidegger . 226 



Factors influencing the lifespan of bees 



by Anna Maurizio ....... 231 



Discussion : Bourliere, Comfort, Hinton, Holt, Kershaw, 



Maurizio, Nigrelli, Rockstein, Sacher, Wigglesworth 243 



The biology of ageing in insects 



by M. Rockstein ....... 247 



Discussion : Berg, Comfort, Gerking, Jalavisto, Kershaw, 



Rockstein, Sacher, Smith, Tanner, Wigglesworth . 265 



The rate of ageing in Drosophila subobscura / 



by J. Maynard Smith ...... 269 ^ 



Discussion : Berg, Danielli, Gerking, Gruneberg, Hinton, 

 Kershaw, Rockstein, Rotblat, Sacher, Smith, Wiggles- 

 worth ......... 281 



Group Discussion 



Benjamin, Chitty, Comfort, Gerking, Holt, Muhl- 

 BOCK, Perks, Rockstein, Rotblat, Sacher, Smith, 

 Tanner, VerzAr ....... 286 



Chairman's closing remarks 



J. F. Danielli 298 



Appendix 



Notes on some mathematical mortality models 



by R. E. Beard 302 



