132 Rev. S. Haughton on the Law of Fatigue. [June 15, 



Dr. Macalister. 



lime 01 Lilt. 



Number of Lifts. 



Mean. 



A. K A „„„ 



20 



18 



18 



20 



19 















0-66 „ 



24 



25 



25 



24 



28 



23 



22 



25 



25 



25 



24-6 



1-00 „ 



23 



25 



25 



25 



26 



29 



25 



28 



28 



28 



26-2 



1-50 „ 



24 



25 



24 



23 



22 



24 



24 



23 



22 



22 



23-6 



2-00 „ 



20 



18 



19 ' 



20 



18 



21 



21 



21 



20 



22 



20-0 



3-00 „ 



14 



13 



14 1 



15 



15 













14-2 



4-00 „ , , 



12 



13 



12 i 



13 



12 













12-4 



6-00 



8 



8 



8i 



8i 



9^ 













8-5 



In the following diagram these results are plotted to scale. 



I shall now proceed to compare these results with calculations made 

 from the Law of Tatigue. In the examples of the Law of Fatigue given 

 in No. VII. the work done by the muscles is dynamical work, and con- 

 sists in lifting weights at a fixed rate until fatigue sets in ; but in the 

 present experiments the work done is partly dynamical and partly 

 statical, the latter consisting in the efforts made by the muscles to 

 hold the weight and arm extended in positions varving from the vertical 

 to the horizontal position. 



Let E-^ be the dynamical work and rate of work, and let W^, 

 be the statical work and rate of work. 



If the work done were purely dynamical or purely statical, we should 

 have, by the Law of Fatigue, either 



= -njT- = constant, 



