Correlalioii oj Brain Ccqxicifi/ uiul. I ntcUhjencc 237 



The general order of these groups is fully supported by the work of 

 Matic'gka and Costa Ferreira. to -vvliieh incidental reference has 

 already been nn\de, and whose work constitutes the line of indiieet 

 comparison now to ho made. Their results have not been incor- 

 porated in the above direct comparisons, because we do not know how 

 thev achieved their r(>sults. and it necessarily follows that if these 

 investigators em|»loyi'd another formula than that herein adopted, 

 their results, in cubic lentimetres, cannot obviously be compared 

 directly with ours. 



Matiegka (12) examined the brain weights of a considerable- 

 number of individuals drawn from different classes of life, and 

 concludes therefiom that it is clear that high intelligence i.s causally 

 associated with an increase in the brain weight. ■ The undoubtedly 

 many discrepancies he ex])lains on the different degree of muscular 

 development of different individuals. His figures, arianged in 

 grammes as given by himself, and in relative numbers worked out 

 bv ourselves, are a.s follows : — ,. „ , ^. 



(.raiiinips. Ifi-I. No. 



1. 14 Day Labourers of th« Navvy Class 1110.0 - loo 



2. ;{4 Workmen - - - - 1 13;?..") - lOl.f) 



3. 14 Minor Officials, Overseers and 



AVatclinien in whom a certain 

 amount of intelligence was 

 necessary - - - - 



4. J 23 Tradespeople and Artisans 



5. 28 Minor Officers, Teachers, Business 



People, Musicians, etc. - 



6. Students, Officers, Doctors, etc. 

 Costa Ferreira (13) measured the cubic capacity of 5.57 skulls from 



tw(» churchyards in Lisbon. They were the skulls of persons whose 

 position in life was known exactly, and which thus permitted of 

 their subdivision into social groups. The average cranial capacity 

 was 1572.72. This capacity must not, howevei'. be compared 

 directly with ours, as it was almost certainly obtained by a dif» 

 ferent method, and as the Avork was done on the skull itself, the 

 measurement is probably direct and not estimated. The order 

 attained by Ferreira'.'-; groups may, howevei". be compared with our 

 OAvn results, and i.s as follows : — 



1. 95 unknown occupation 



2. 12 House Proprietors 



3. 1(J4 Daily Liihourers 



4. 130 Workmen 



5. 52 Public Servants im the Pension 



List - - . - 



fi. 11 Public Servants • 



7. 49 Business Men - - - 

 .s. <J3 Members Learned Professions 



