62 
MR. W. BEVAN LEAV1S OR THE COMPARATIVE 
22. The ganglion cells of the Pig and Sheep differ wholly in type from those of 
higher Mammals, and approach closely in appearance the large pyramidal cells of the 
third layer in Man and the Ape. 
23. The appearance presented by the first layer in all this series of animals 
indicates very strongly the proportionate increase of the connective element over the 
nervous in animals lower in the scale of organisation. 
24. The globose cell characterised by its contour and great deficiency of organic 
connexions, and which is found in large numbers in the brain of idiots, reappears as a 
normal element in the cortex of the Pig and Sheep. 
Dimensions of Ganglionic Cells in Cortex of Pig. (See fig. 2.) 
Site of 
section. 
Limbic 
lobe. 
Fourth parietal 
gyrus. 
Third parietal 
gyrus. 
First and second 
parietal gyrus. 
n n 
H n 
p p 
p 
A. . . . 
47 x 17* 
42 x 20 
. . 
37 x 
21 
B. . . . 
48 x 17f 
37 x 21 
37 x 
18 
C. . . . 
41 x 11 
36 x 19 
26 x 18 
28 x 
18 
D. . . . 
38 x 18 
39 x 24 
31 x 18 
37 x 
18 
E. . . . 
28 x 17 
40 x 17 
26 x 20 
37 x 
27 
E. . . . 
25 x 19 
25 x 19 
33 x 19 
21 x 
19 
G. . . . 
29 x 17 
29 x 17 
29 x 
17 
Note. — jj., or 
micromillimetre 
= - 001 millim. 
Depth of Cortical Layers from before backward. 
Limbic Lobe. 
mm. 
mm. mm. 
mm. mm. 
mm. 
mm. 
First layer. 
•790 
•558 - 558 
■511 - 65l 
•651 
Average = '619 
Second and third layers 
•930 
•837 -799 
1-488 -697 
•744 
„ '897 
Ganglionic layer . 
•650 
•465 - 604 
■372 -697 
■558 
„ -557 
Spindle layer .... 
. 2-604 
2-617 1739 
2-604 1-488 
1-813 
„ 2T44 
Upper Parietal Convolutions. 
mm. 
mm. mm. 
mm. mm. 
mm. 
mm. 
First layer. 
•372 
•372 -372 
•465 - 744 
•558 
Average = '547 
Second and third layers 
•937 
•744 -744 
1116 1116 
1-116 
•962 
Ganglionic layer . 
■372 
■279 -232 
•186 -372 
•372 
„ '302 
Spindle layer .... 
. L600 
1-255 1-730 
2-139 1-999 
1-395 
„ 1-689 
Lower Parietal Convolutions. 
mm. 
mm. mm. 
mm. mm. 
mm. 
mm. 
First layer . 
•418 
•372 -372 
•558 -372 
. . 
Average = "418 
Second and third layers 
•930 
1-300 1-116 
•744 -930 
1-116 
„ P022 
Ganglionic layer . 
•232 
•373 -232 
•558 -232 
•325 
„ -344 
Spindle layer .... 
. 1-860 
1-860 2-232 
1-488 1-488 
2-232 
„ 1-860 
# Largest cell observed=69/< x 32/<. 
t Largest cell observed = 70/i x 2 7/*. 
