of certain Ancient British Skull Forms. = 67 
to recognise in their parietal conformation the constant 
occurrence of the same unsymmetrical inequality. 
But besides the well-known distortions produced in many 
American crania by protracted compression purposely ap- 
plied with a view to change the form, others of a less 
marked character closely correspond to those of the British 
brachycephalic crania. The normal human head may be 
assumed to present a perfect correspondence in its two 
hemispheres; but very slight investigation will suffice to 
convince the observer that few living examples satisfy the 
requirements of such a theoretical standard. Not only is 
inequality in the two sides frequent, but a perfectly symme- 
trical head is the exception rather than the rule. The 
plastic condition of the cranial bones in infancy, which ad- 
mits of all the strange malformations of ancient Macroce- 
phali and modern Flatheads, also renders the infant head 
liable to many undesigned changes. From minute personal 
examination I have satisfied myself of the repeated occur- 
rence of inequality in the two sides of the head, arising 
from the mother being able to suckle her child only at one 
breast, so that the head was subjected to a slight but con- 
stantly renewed pressure in the same direction. It is sur- 
prising, indeed, to how great an extent such unsymmetrical 
irregularity is found to prevail, when once the attention has 
been drawn to it. The only example of the Greek head 
possessed by Dr Morton, was a cast presented to him by 
Dr Retzius, and which, from its selection by the distin- 
guished Swedish craniologist for such a purpose, might 
reasonably be assumed to illustrate the Greek type. It is 
accordingly described by DrJ. Aitken Meigs, in his ‘‘ Cranial 
Characteristics of the Race of Man,” as very much resem- 
bling that of Constantine Demetriades, a Greek native of 
Corfu, and long a teacher of the modern Greek language at 
Oxford, as engraved in Dr Prichard’s Researches. Its cranial 
characteristics are thus defined in the Catalogue of the Mor- 
tonian Collection (No. 1854): ‘“ The calvarial region is 
well developed, the frontal line expansive and prominent, the 
facial line departs but slightly from the perpendicular.” On 
recently visiting Philadelphia for the purpose of renewed 
examination of its valuable collections, I was surprised to 
