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 1 

 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 i 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 



