ON THE BEAINS OE TWO IDIOTS OF EUROPEAN DESCENT. 
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in proportion to his body, than the idiot woman, i. e. in the ratio of 3 to 1, but also 
larger in proportion to the healthy standard at the same age — the ratio in his favour then 
being, however, only as 4 to 3. 
Lastly, as shown in the Table, in the idiot woman the ratio between the cerebrum and 
cerebellum is 3'9 to 1, in the idiot boy 2-6 to 1. Hence the idiot woman’s cerebrum, in 
proportion to the cerebellum, is superior to the idiot boy’s in the ratio of 3 to 2. But 
comparing these abnormal proportions with those observable in healthy persons of cor- 
responding sex and age, the proportion of cerebrum to cerebellum in the idiot woman 
is to the natural proportion as 1 to 2, and in the idiot boy as about 1 to 3. In other 
words, the cerebrum in the woman, when compared with the cerebellum, has half the 
normal proportion, whilst in the boy it has only one-third. These figures show, not 
merely the exceedingly small relative size of the cerebrum in both idiots, but a marked 
superiority on the side of the woman ; for whet her we compare the actual ratios between 
the cerebrum and cerebellum in the woman and in the boy, or whether we contrast 
their respective ratios with the healthy standards, the superiority of the female’s cere- 
brum, as compared with her cerebellum, is to the boy’s, in either case, as 3 to 2. 
The general conclusions may thus be stated. These idiots fell remarkably short in 
both cerebral and cerebellar mass : in each the deficiency in cerebral mass was greater 
than in cerebellar : the idiot boy had more cerebellum than the idiot woman : the idiot 
woman had more cerebrum than the idiot boy. 
c. The general Form , Dimensions , and relative Positions of the Parts of the 
Idiots' Encephala. 
Judging from the intracranial cast, the general form of the cerebrum in the idiot 
woman, as compared with the normal human cerebrum, is, when seen from above, a 
short oval rather than a long ovoid, — the greatest transverse diameter being about the 
middle of the mass, and having a ratio to the length of 1 to 1T4 instead of 1 to 13. 
Far from being concealed, the cerebellum projects largely behind the cerebrum, and 
thus gives a long figure to the whole encephalon. Seen laterally, the entire brain has a 
low, contracted, globular outline, except of course below. The cerebellum appears to 
form about a fourth part of the mass, and projects beyond the cerebrum '35 of an inch. 
In the base view, the relative preponderance of the cerebellum is again the most striking 
feature. The temporal portions of the cerebrum appear full and prominent ; no part 
of the parietal region is seen on either side of them, and no part of the occipital either 
behind or at the sides of the cerebellum. The frontal region is singularly short, narrow, 
and pointed, instead of square, in front. The orbital surfaces are much excavated, the 
beak-like prominence of their median portions is well marked, and a slightly obtuse 
angle is formed by the meeting of their planes in the middle line. 
In size and general form, the encephalon of the idiot woman, as represented by the 
intracranial cast, resembles at first sight that of the young Chimpanzee but a nearer 
