188 =. Haughton— Mechanical Work done by a Muscle. 
t x represent the unknown weight held in the hand which 
would represent the total effect, both of refreshment by rest, and 
aid from other muscles. 
DraGrRam IJ.—Prof. Nipher. First Series. 
A, Asymptote w+a’=0; B, asymptote n=—0. 
(w+a'lyfn=A. a'=1°05 kil. A=1018. 
Equation (2), which suited the eas of my own experi- 
ments, must now be modified as folloy 
Sl Setar 8 n= A, (4) 
or (wa ‘\Fn=A (5) 
=r a’ a—x. (6) 
‘is obviously less than a, and may even become negative, 
aacedine to the quantity of refreshment and aid afforded to the 
laboring “mauscles. 
