186 =. Haughton—Mechanical Work done by a Muscle. 
These values were obtained by finding the value of a, which 
renders A most near! y constant, or 
6A eat 
A = minimum. 
This table gives 7 Ibs. for the mean weight of the arm of all 
experimented on, a result which accords with known facts. 
7) U 2 4 8 1U 26 
DiacRaM I.—Dr. Haughton. Mean of 20 Experimenters. 
A, Asymptote w+a’=0; B, Asymptote n=0. 
(w-+a)’n—A. a==3°5 lbs. A=4699. 
In the accompanying, diagram I, I have plotted the cubical 
hyperbola represented by equation (2); and also the several 
observations which lie sufficiently near the curve to justify me 
in considering the Law of Fatigue to be a first approximation 
to one of the fundamental laws of muscular action. 
