476 PROCESSES INFERRED FROM INDIRECT OBSERVATION 



with the average values actually obtained from weighings of large 

 numbers of infants the constants " a," " k" and " t," are calculated from 

 all of the observations by the " method of least squares. In this way, 

 for example, we find that the growth of British male infants born in 

 South Australia, during the first nine months succeeding delivery, is 

 expressed by the formula 



Iog 10 - = 0.136(t - 1.66) 



341 .5 x 



time being reckoned in months from birth and weights in ounces avoir- 

 dupois. In the following table the observed weights at the various 

 ages are compared with those calculated from this formula: 



Age of infant 

 in months. 





 1 

 2 

 3 



4 

 5 

 6 



7 

 8 



The equation to the curve of growth for the first nine months of the 

 extra-uterine life of South Australian females is found to be: 



and in the following table the observed weights at various ages are 

 compared with those calculated from the formula: 



SOUTH AUSTRALIAN FEMALES. 



A similar comparison follows for British infants born in England: 

 The equation to the infantile growth-cycle during the first nine months 

 m males is represented by the formula: 



io 



5 lo 



0.127(t - 1.46) 



