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Dk. Cunningham—Surface Anatomy of the Primate Cerebrum. vii

certain districts of cerebral surface, by a want of harmony in the growth-
rate of the different cranial bones, or by these influences acting together ?

The results which I have obtained are given in the first five Chapters.
Each of these is more or less complete in itself in so far as it represents an
independent piece of work, which was finished, and, in the case of the
earlier Chapters, printed before the succeeding Chapters were commenced.

The last Chapter is the work of Professor Victor Horsley. It deals with
the Cranio-Cerebral Topography, and I consider myself fortunate in being
able to incorporate in this Memoir so valuable a contribution on a subject
of such vital importance to all interested in the advance of cerebral surgery.

Material.—For more than four years I have been collecting material
for this work. The following is a list of the cerebral hemispheres which I
have had at my disposal:—

Period of Growth.

No. of
Hemispheres.

Period of Growth.

No. of
Hemispheres.

From the end of the second month



Children, four to five years, .

. 14

of development up to full time,

. 104

Girl, eleven years old, .

2

Full-time foetuses, .

. 24

Boy, twelve and a-half years old,

2

Children, three months, .

6

Youth, fifteen years old,

. 2

Children, six months,

. 4

Adults, ....

. 82

Children, twelve months, .

. 4





In so far then as the developing festal brain is concerned my material
has been very abundant. The same also may be said for the adult brain,
because the number 82 in the above Table merely refers to those hemispheres
which I have specially prepared for measurement. In dealing
with other points many additional adult hemispheres were available.
The list shows a great deficiency in the brains of children.

Methods employed.—Certain of the questions involved in this inquiry
could only be elucidated by careful measurements of the cerebral surface
at different periods of growth. To obtain these with any degree of
accuracy it was absolutely necessary that the natural configuration and
shape of the cerebral hemispheres should be preserved in every detail.
Anyone may satisfy himself that the most different measurements may be

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