358 Dr. Clarke’s Obfervations on the 
dimenfion from the fuperior and anterior part of one ear, acrofs 
the fontauelle, to a fimilar part of the oppofite ear/ Thefe di- 
menfion s appearedto me the moftlikely to afford data for deter-* 
mining the refpe&ive fees of the brain in the different fexes. 
The refult was as follows : 
Twenty males, 
, Twenty females. 
Weight. 
Circumference 
Dimenfion* Weight. 
C ire um f. 
Dimen. from 
lbs. &e. 
of heads. from ear to ear. lbs. &c. 
of heads. 
ear to ear. 
Inches* 
Inches. 
Inches. 
Inches. 
Experiment 1. 
1491 
282 
*52 137? 
272 
*43 
Experiment 2. 
» 44 l 
*77 
146* 135 
272 
147 
Experiment 3. 
148 
280 
247! 132 
273 
143? 
Totals. 
442 
839 
445 ? 404 * 
817 
433J 
Average weight, &c. 
7 lb*. 5 oz. 7 dr, 14 7 \ 6 lbs. 1 1 oz. 6 dr. 13I 7* 
Having found the relative proportions between the fexes to 
turn out thrice with fo much uniformity, and obferving them 
to correfpond pretty nearly with fome experiments, made for 
very different purpofes by the late Profeffor Roederer, of 
Gottingen, I did not think it neceflary to profecute the fubjeft 
farther. 
Upon the whole, it may be obferved, that the difference of 
weight between the male and female at birth may be rated at 
about nine ounces, or nearly a twelfth part of the original 
weight. In the circumference of their heads there is a dif- 
ference of near half an inch, or about a 28th or 30th part ; 
and the fame proportion of a 28th is pretty nearly prefer ved in 
the tranfverfe dimenfion. It is evident, as the bony paffage 
5 through 
