ON THE WORK OF THE ANTHROPOMETRIC LABORATORY. 621 



females at the 25th grade it is 350 ; at the 50th, 85S ; at the 75th, 373 ; 

 'Q' equals 11, and the corrected mean is 361. 



The corrected mean stature of the males is made up, according to the 

 foregoing figui'ea, by the different parts of the body in the following pro- 

 portions : The head, neck, a,ud trunk contribute 52'6 per cent., the 

 thigh from the lower level of the tuber ischia to the knee 22'2 per cent., 

 and the leg and height of the foot 25*2 per cent. In the females the head, 

 neck, and trunk form 51'3, the thigh 22'4, and the log and height of the 

 foot 24<'5 per cent, of the mean corrected stature. 



Vertical Projection of the Head. — This is the vertical distance from the 

 vertex to the under surface of the chin. In the males it is at the 25th 

 grade 206 ; at the 50th, 214 ; at the 75th, 222 ; ' Q ' equals 8, making 

 the corrected mean 214. The vertical projection of the head contributes 

 12 "4 per cent, of the corrected mean stature of the body. In the females 

 the mode of dressing the hair has so much interfered with the results that 

 they would appear to have longer heads than the males, and have conse- 

 quently been omitted. 



Distance from Vertex to Mouth. — In the males it is at the 25th 

 grade 156; at the 50th, 165; at the 75th, 172 ; 'Q ' equals 8, and the 

 corrected mean 164. The vertex to the mouth contributes 76 '8, and the 

 chin 23'2 per cent, to the total projection of the head. 



Distance from Vertex to Tragus. — This represents, as far as is possible 

 on the living, the height of the head. In the males it is at the 25th 

 grade 124 ; at the 50th, 130 ; at the 75th, 133 ; ' Q ' equals 4, and the 

 corrected mean 128. Owing to the uncertainty of the results the females 

 are omitted. 



Length of Head. — In the males at the 25tb grade it is 195 ; at the 

 50th, ]'99 ; at the 75th, 203 ; ' Q ' is 4, and the corrected mean 199. 

 In the females it is at the 25th grade 186 ; at the 50th, 189 ; at the 75th, 

 192 ; ' Q ' is 3, and the corrected mean 189. 



Breadth of Head. — In the males it is at the 25th grade 152 ; at 

 the 50th, 156 ; at the 75th, 160 ; ' Q ' is 4, and the corrected mean 

 156. In the females it is at the 25th grade 145 ; at the 50th, 148 ; at 

 the 75th, 150 ; ' Q ' is 2'5, and the corrected mean 147"5. 



Proportions of the Head. — The cephalic index in the males varies from 

 71 to 91 ; at the 25th grade it is 766 ; at the 50th, 78-5 ; at the 75th, 

 79'9 ; ' Q ' is 1"6, and the corrected mean is 78"3. It will be seen from 

 this that the 25th and 75th grades lie in the mesaticephalic group. 

 According to the international division of the cephalic index on the 

 skull, 8 of the series are dolichocephalic, 44 are mesaticephalic, 19 are 

 brachycephalic, 1 is hyperbrachycephalic, and 1 is ultrabrachycephalic. 

 In the females the cephalic index varies from 73 to 84 ; at the 25th 

 grade it is 76-5 ; at the 50th, 78-6 ; at the 75th, 80 ; ' Q ' is 17, and the 

 corrected mean 78*2. The index in the two sexes at the different grades 

 agrees very closely. By the international division 2 of the females are 

 dolichocephalic, 18 are mesaticephalic, and 8 are brachycephalic. There 

 is thus less variation in the form of their heads than in the males. The 

 height-length index in the males is 64'5, taken from the corrected mean 

 measurements of length and projection from vertex to tragus. The 

 module of the head, obtained by adding the length, breadth, and height 

 together, adding to their product 15 in the case of males and 13 for 

 females, and dividing the whole sum by 3, is, in the males, at the 25th 

 grade, 1579 ; at the 50th, 161-4 ; at the 75th, 165 2 ; ' Q ' is 3 6, and 



