88 
quent generations, by the process of evolution, this fold would 
become more developed, and the ape would speak; in fact, 
would become a man ! As, however, this fold has not been 
proved to be the seat of speech in man, the Darwinian argument 
from analogy of structure falls to the ground, and speech re- 
mains a barrier the brute is not destined to pass. 
ENGRAVING OF THE CONVEX SURFACE OF THE LEFT HEMISPHERE. 
Showing the Disposition and Arrangement of the Cerebral Convolutions. 
The above engraving is the same as that used to illustrate the author’s work on 
Aphasia. It is from a cast kindly sent to Dr. Bateman by his friend. Professor 
Broca, of Paris. 
The anterior lobe is that portion of the hemisphere which is bounded behind by 
R R, the fissure of Rolando, and below by S S, the fissure of Sylvius. 
F F, transverse frontal convolution. 
P P, transverse parietal convolution. 
0 0, the orbital convolutions, where Gall placed the organ of language. 
1, 2, 3, first, second, and third frontal convolutions. The third frontal is the con- 
volution alluded to by Carl Vogt as being very slightly developed in the ape and in 
the microcephali, and it is in the posterior part of this fold that Professor Broca has 
located the faculty of speech. 
T. ], T. 2.— First and second temporo-sphenoidal convolutions. 
I, Island of Reil (the superior and inferior marginal convolutions are represented 
as being drawn asunder so as to expose it). 
