CONTENTS 



PAGE 



Chairman's opening remarks 

 J. F. Danielli . 



Actuarial aspects of human lifespans 



by B. Benjamin ....... 2 )/ 



Discussion: Benjamin, Berg, Comfort, Danielli, Gerking, 

 Gruneberg, Jalavisto, Rockstein, Rotblat, Sacher, 

 Smith ......... 15 



Parental age effects on man . 



by Eeva Jalavisto ....... 21 ./ 



Discussion : Benjamin, Berg, Comfort, Danielli, Hinton, 



Jalavisto, Muhlbock, Rockstein, Sacher, Smith . . 31 



Studies on the longevity and mortality of English thorough- 

 bred horses 



by A. Comfort ........ 35 ^ 



Discussion: Comfort, Hartwig, Kershaw, Rockstein, 



Smith ......... 55 



Lifespan of cattle and horses under various climatic con- 

 ditions and the reasons for premature culling 



by W. Hartwig ....... 57 



Discussion: Benjamin, Bourliere, Comfort, Danielli, 



Hartwig, Kershaw, Muhlbock, Wolstenholme . . 70 



Onset of disease and the longevity of rat and man 



by H. S. Simms, B. N. Berg, and D. F. Davies . . 72 



Discussion: Berg, Bourliere, Comfort, Gerking, Grune- 

 berg Holt, Jalavisto, Muhlbock, Perks, Rockstein, 

 Rotblat, Sacher, Smith, Tanner, Verzar, Wigglesworth 79 



Lifespans of mammalian and bird populations in nature 



by F. Bourliere ....... 90 



Discussion: Bourliere, Comfort, Chitty, Danielli, Ker- 

 shaw, Sacher, Scheidegger, Smith, Rotblat . . . 103 



Arteriosclerosis in birds 



by S. Scheidegger ....... 106 



Discussion: Berg, Bourliere, Comfort, Danielli, Hinton, 

 Kershaw, Jalavisto, Lindop, Nigrelli, Rockstein, 

 Scheidegger, Verzar . . . . . . .112 



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