300 THE TREND OF THE RACE 
employed by Pearson and his colleagues we may consider the 
First Study of the Statistics of Pulmonary Tuberculosis which gives 
data on the order of birth and size of family of 381 tuberculous 
patients from the Crossley Sanitorium at Frodsham, England. 
The assumption was made,—which could not be far from the 
truth—that only one patient was drawn from a single family, and 
since there were 381 families represented, each of which must have 
contained a first born member there must have been 381 individ- 
uals among the families represented who were first born-children. 
Since the size of the families was ascertained the numbers of 
second, third and subsequent born could readily be calculated. 
If we divide the tuberculous patients in the first, second and third 
born, etc., in the same ratio in which these classes occur in the 
members of the tuberculous families in general, we obtain a series 
of numbers which may be compared with the members of first, 
second, third, etc., born among the tuberculous patients which 
were actually found. The following table gives the expected 
frequency of tuberculosis patients and the actual frequency in the 
groups representing the various orders of birth: 
Over 
Order of I 2/3]4 {5 |6)|7 | & |g9|}zro|r1r| 12) 13) 14| 14 
Birth 
No. of cases 
observed. .113 |79 |4z |52 |39 |18 |z8 | 9 | 3/3 |3 |r |x |r Jo 
No. of cases 
calculated. .| 67.1]64.4]58.5]50.9143.5/32.6)22.2]15.1]10]6.2|3.7|2.6|1.6|r.1|1.6 
The table indicates a great preponderance of the tuberculous 
among the first born. Comparisons of the distribution of tuber- 
culous patients with the relative proportions of first, second and 
subsequent born among the population of New South Wales 
showed the same excess of the tuberculous among the earlier 
born individuals. 
Dr. Heron has come to the conclusion that insanity is especially 
prone to attack the first born members of a stock. In Goring’s 
