296 | Royal Society :— . 
0:95 x 2:59 
+0°56 x 1:14 
0:40 x 1:87 
Me XIl=K xX eae 
+0:25 x 0°89 
_ +0:00 x 0°59 
or, 
(2-460 
+0°638 
+0:748 
+1462 
+-0-222 
. -+0:000 
5530 
6105=Kx < 
and, finally, 
OF ls 
Seg 110 4 lbs. es 
It appears from the foregoing considerations that the force of 
contraction of the muscles, per square inch, is in . 
Theatmc. 2.245 2 ue 
The lew cosy fn eo Pe Se 
These numbers are, perhaps, as near to each other as this class 
of observations admits of; but I believe that they do not differ 
so much really as they appear to do, for the following reason :— 
As it was not convenient to procure a good subject destroyed 
by a violent death, I made use of a powerful man who had died 
of cholera * and who had been a blacksmith by profession. Now 
it is natural to suppose that the muscles of the arm of a black- 
smith are more developed than those of his leg; so that their cross 
section would be relatively too great, and the coefficient derived 
from that cross section, therefore, too small. I therefore com- 
ared the sections of the biceps hwmeri and brachieus, found 
by me, with the only other measurements with which I am 
acquainted, for the knowledge of which I am indebted to Dr. 
W. Moore of Dublin, who translated the results for me, from 
the Dutch, of Messrs. Donders and Mansfelt + of Utrecht. 
Cross Sections of Biceps hwmeri and Brachieus. 
millims. sq. in. 
1. Biceps humeri (long head) ... . . 530 0°821 
x , (short head) . . . . . 462° O-7O1 
DEORE we a bd 614 0°952 
1596 2°474 
* It is well known that after death by cholera, life continues in the muscles, 
and manifests itself for some hours by movements, and by the existence of the 
muscular susurrus. ~ This latter fact, the first notice of which belongs to Dr. 
Collongues, of Paris, I have repeatedly verified, as also the continuance of the 
susurrus in cases of death by zetanus. It appeared to me, therefore, that such 
a subject as I selected was one well suited to the purpose of my observations. 
t Over de Elasticiteit der Spieren. Utrecht, 1863. 
