MR. O. UDNY YULE ON THE ASSOCIATION 



to note that apparently, from Mr. GALTON'S figures, there is a negative correlation 

 between the artistic character of parentage and fertility ; thus : 



When both parents are artistic, number of children to fraternity is 4'93 

 one parent is 5'15 



neither 5 '28 



This would not, however, affect the association between artistic faculty of parentage 

 and offspring, as increasing or decreasing the frequencies 296 and 372 in any con- 

 stant ratio would not alter the ratio of the cross-products. The interest lies in the 

 fact that artistic faculty is apparently a heritable attribute associated (negatively) 

 with fertility, and hence (as Professor PEARSON has pointed out) would tend to dis- 

 appear in the absence of opposing causes. 



48. Assortative Mating according to Stature. I give this example as an instance 

 of the fact that the association between attributes depends very largely, in some 

 cases, on what I have called the choice of axes, i.e., the strictness of definition of the 

 attribute. The following are the data giving the number of observed cases in which 

 a tall, medium, or short husband was mated with a tall, medium, or short wife 

 (" Natural Inheritance," p. 206). 



Now, if we take the dividing point between the " tall" or " fairly tall," and " fairly 

 short " or " short" to be (1) between tall and medium, (2) between medium and short, 

 we get the following data : 



