ON ANTHROPOMETRIC INVESTIGATION IN THE BRITISH ISLES, 365 
the standard sizes of mounts adopted by the British Association’s Com- 
mittee on Anthropological Photographs. The ordinary ‘cabinet-mount ’ 
is used for all sizes up to and including ‘ half-plate.’ 
The risk of fading is minimised by avoiding gum or paste ; each print 
being secured by its corners to slits cut in the mount, as in a post-card 
album. But the only complete security is the use of a really ‘ permanent’ 
process such as Platinotype. 
DETAILED DIRECTIONS AS TO Posn. 
For purposes of comparison, uniformity of pose is essential in photo- 
graphs in classes B and C' (see above). 
For side-face (B*) and for full face (B’) the head should be posed so 
that a line drawn from the inferior orbital margin to the tragus of 
the auricle is horizontal. This is a test which can be directly applied in 
‘either pose with the help of sights and a level on the side of the camera ; 
for the axis of the camera should lie in the same horizontal plane with 
the line from the inferior margin of the orbit to the tragus. 
Without such provision for uniformity, differences of face projection 
and prognathism are liable to be obscured or misrepresented. 
The subject should look at some object on a level with his eye and at 
a moderate distance from it. 
For top view of the head (B°) the following methods are practicable :— 
1. Set the camera on a high stand, pointing vertically downwards, 
and make the subject sit on the ground below it, with his head posed as 
for side view. 
2. Set the camera to point horizontally, and make the subject lie on 
his back on a table of suitable height, with his head towards the camera. 
The line from the inferior margin of the orbit to the tragus should now 
be vertical. 
3. Set the camera to point horizontally ; set a chair with its back to 
the camera ; make the subject sit straddlewise on the chair, facing the 
camera ; let him fold his arms on the back of the chair, and bend forward, 
resting his head on his arms, and looking downwards, till the head is 
in the right pose ; when a plumb-rule will test the line from the inferior 
margin of the orbit to the tragus, 
SUGGESTIONS FOR RAPIDITY AND UNIFORMITY. 
By attending to the following hints successive sitters may be made 
to occupy so nearly the same position that the camera need hardly be 
refocussed :— 
1. Much time will be saved if all the side-faces are taken first, and 
then all the full-faces ; the latter should occupy a different chair, in which 
case the position of the camera would require to be changed after com- 
pleting the first series of photographs; unless, indeed, there happen to be 
two operators, each with his own camera, ready to take the same persons 
in turn. 
2. If the camera has a stand with vertical rack-and-pinion adjustment, 
the subject’s place should be fixed, and the camera should be raised and 
lowered to suit each subject. A square of the standard size of the picture 
should be ruled on the focussing screen of the camera. 
3. For field work, and wherever the camera has no such adjustable 
stand, the eamera should be set at a fixed height and all the subjects 
