THE RATE OF GROWTH 



107 



regretted, and it would be an important addition to 

 our scientific knowledge could statistics of the growth 

 of man be gathered with due precautions. It would 

 fill one of the gaps in our knowledge which is lament- 

 able. We have, however, some rough, imperfect data 

 which for our present purposes it seems to me are 

 adequate, and the results of the study of these will be 

 shown by the next series of pictures. 



But let us pause for a moment to consider this 

 singular table. It shows in the second column the 

 number of days required for each species of animal 



TABLE I 



indicated at the left to double its weight after birth. 

 A man takes 180 days to double his weight; a 

 horse, 60 ; a cow, 47 ; a goat, 19 ; a pig, 18 ; a sheep, 

 10 ; a cat, 9^ ; a dog, 8; a rabbit, 6 (or possibly 7 

 days). Now here are analyses of the milk. The 

 main point of interest is to be found in the figures in 

 the third column, which represent the amount of albu- 



1 After Abderhalden, Zeitschrift fur Physiologische Chemie, Band XXVI., 

 p. 497. 



