Freiburger historische Bestände - digital

326

Cunningham Memoirs.

35 degrees. It is clear that a variable point in this method is the termination
of the greatest transverse diameter; and Giacomini himself admits that
out of twenty-eight hemispheres, it fell twelve times in the superior temporal
fissure, i.e. in the parallel sulcus, nine times in the third temporal convolution,
and seven times in the middle temporal convolution. The point at which he
estimates this transverse diameter of the plane cuts the fissure of Rolando
in a majority of cases is half way between the sagittal suture and the end
of the greatest transverse diameter. This point, he says, out of the twenty-
eight cases, fell fourteen times exactly in the fissure of Rolando, six times
behind it, and eight times in front of it. When the line of the fissure of
Rolando fell, as it did in one exceptional case, posteriorly to the estimated
position, he found it was due to a remarkable degree of brachycephaly,
the index being 94*3. In examination of these latter measurements considered
with the question of the proportional shape of the head, he came
to the conclusion that the distance of the upper end of the fissure of
Rolando from the coronal suture averaged 55 mm. in the dolichocephalic
head, and 54'4 in the brachycephalic, and that of the lower end from
the coronal suture was in the former case, 26*5 mm., but in the brachycephalic
only 20-08.

(b) Absolute measurements.—The confirmation of the foregoing conclusions
may be made by employing the data obtained from absolute measurement
of the distance of the "upper end" of the fissure of Rolando from the
highest point of the coronal suture. Such data are as follows:—

Observer.

JSTo. of Cases
Examined.

Distance of Rolando (upper end) from Coronal Suture.

Broca, ....



4-7 cm. (In 1861, of 11 males, 4-6-3 cm.)

Hefftler,

20

4-8 cm. (mean).

Turner, .



4'4 (mean).

Foulhouze,

9

5'0 (mean).

Championniere,



5-$ cm.

Fere, ....



4-7 to 4-8.

Hare, ....



4-76.