('ovrcldlioit of liraln (kipacity and I ntt'Uigcnce. 235 



Skull,"' l)y Alice Let.', with .soiiie assistainc fioia Kail I'rai^on (!)). 

 If is important to iioti? that all are males ami that, as stated, the 

 iiU'thods of working' are precisely similar to those adopted by us 

 r<ir the ciimiiials. 



or the *2ir) Middlesex and Kiu<^"s College students, the necessary 

 -<lata of len<j;th, hieadth and height have been taken by us from 

 (Gladstone's l!)()fi woi-k (2), and the cubic caiiacities wcjrked out by 

 •oil I'selves with the same fornnda as l)efore. For the results of the 

 former we are not, therefore, res])onsible, but for the latter aiiv 

 <'rrors arc oui- own. 



In our second <j:rou]( of com])arativc data, where, the methods of 

 woiking having been different, only indirect comparisons can be 

 instituted, we shall uvail ourselves of the published work of 

 Matiegkji (12) and Costa Fcrreira (20). To these I'efcrcnce wili be 

 Tiiade later. 



The true mean of the cubic capacity of brain of the -ioo criminals 

 ^if the present work is 14-^7.76 cc. Tlie range of vai'iation extends 

 from IKJi ic, which occurred in a male aged ()"), to 1771 cc, 

 which also occurred once in a male aged 'V-^. Both the niininuun and 

 maximum figures recorded by us occurred in persons convicted for 

 larceny; this, howevei-, nniy be merely a coincidence due to the 

 fact that the cases of larceny in the present series comprise a larger 

 number than any of the other gr<nip.s. Expressed differently, if the 

 true UK.-an of the cul)ic capacity of these criminals be regarded as 

 l)eing ei[ual to KXI, then the minimum and maximum ranges of 

 variation wouhl l)e indicated by the figures 80.9 and 12.'j. 



Fo)' the •{.■) anatomists, the figures as furnished by Lee and Pear- 

 .son arc for the true mean of the cubic capacity 1537. If the amount 

 <)i l)rain cubic ca])acity of the .355 criminals be regarded as being 

 cipial to loo, then the relative ])ro])ortion of brains possessed by the 

 -ia anatomists is !(l(i.S. The range of variation in the -55 anatomists 

 -extends from I. '572. wliich occurs once in a (lerman anatomist who 

 was attemling the Congress at which th(> heads were measured, to 

 IS I. "5. which occtiis once iji a Welshman. If the anatomical true mean 

 be regarded as IvMiig 10(1, then the i-ange of variation extends from 

 .Si). 2 to 1 17.0. 



In the case of the 25 members of the teaching staff of Cniversity 

 <'ollege. London, till" trtu' mean of the cubic c-apacity, as given In- 

 Lee and Pearson, is 1511, with a range of variation from l."552 to 

 J(5."{-5, or in relative numliers, as })efore, from 89 to KiS. 



For the males attending the JJritish Association for th(^ Advance- 

 ment of Science the true mean of the cubic capacity is 1495. As 

 the minimum "and maxin)\im figures are not furnished by Lee and 

 Pearson, we are unable to <]tn>te the range of variati<ui. 



