22 



INTRODUCTORY 



Secondly, it seems that there is a similar relation between 

 growth-rate and correlation, as Boas has pointed out in the 

 case of the human being. 



The accompanying table (Table III), which gives the value 

 of the correlation coefficient between several pairs of organs 

 in the young Trout, shows that in many cases total length and 

 breadth of caudal fin, total length and length of anterior dorsal 

 fin, total length and length of head, head length and eye 

 diameter there is a significant diminution in the value during 

 the time that shows a decrease in growth-rate. The increases 

 seen in certain cases in the table are within the limits of error. 



TABLE III. TROUT LARVAE. CORRELATION COEFFICIENTS (p). 



Boas has brought forward mathematical proof that the 

 magnitudes of the variability and of the correlation coefficient 

 are necessar}^ consequences of those of the growth-rate, rising 

 and falling with it. 



But apart from this, considerable interest attaches to this 

 question of the change in the degree of correlation during 



