io8 



SEX AND HEREDITY 



some measure of intelligence in children. For instance, 

 the class attained in the same school at a given age is an 

 automatic indicator of a certain kind of intelligence. 

 Therefore in this investigation we measure the resemblance 

 between brothers or sisters, instead of between parents 

 and offspring. 



Table 3 summarises the investigations of Schuster and 

 Elderton on the school records at Charterhouse. The 

 ' division ' in which each boy was situated when he 

 reached the age of sixteen was extracted from these 

 records, and the Table compiled in the usual way. (The 

 divisions are numbered from .1 to 7, the first being the 

 highest.) 



TABLE 3. Position of pairs of brothers in Charterhouse 

 School at age 16. Correlation = -46 



It is plain that we can measure the intensity of re- 

 semblance between pairs of brothers, etc., in the same 

 way as we measured it between parent and offspring, 

 and arrive at a figure for the correlation. In the above 

 Table this figure works out to -46. Now in the case of 



