92 AGE, GROWTH, AND DEATH 



of the guinea-pigs, and of other animals which I 

 have since had an opportunity of experimenting with, 

 that we get indeed a clearer insight as to what the 

 rate of growth really is and really means. 



I should like to pause a moment to say that when 

 I first published a paper upon the subject of growth, 

 it, fortunately for me, interested the late Dr. Benja- 

 min A. Gould. The experiments which I had made 

 and recorded in that first publication came to a sud- 

 den end, owing to a disaster for which I myself was 

 personally not responsible, by which practically my 

 entire stock of animals was suddenly destroyed. Dr. 

 Gould, after consulting with me, proposed that I 

 should have further aid from the National Academy 

 of Sciences, and through his intervention I obtained 

 a grant from the Bache fund of the Academy. That 

 liberal grant enabled me to continue these researches, 

 and this is the first comprehensive presentation of 

 my results which I have attempted. In this and the 

 subsequent lectures, I hope that enough of what is 

 new in scientific conclusions may appear to make 

 those to whose generosity I am indebted feel that it 

 has been worthily applied. I cannot let such an oc- 

 casion as this pass by without expressing publicly my 

 gratitude to Dr. Gould for his encouragement and 

 support at a time when I most keenly appreciated it. 



If animals grow, that which grows is of course the 

 actual substance of the animal. Now we might say 



first defined and advocated by me in my article, " Senescence and Rejuvena- 

 tion, " Journ. of Physiol., vol. xii., pp. 97-153 (1891). 



