ANIMAL MECHANICS 



4G5 



Fig. 109. 



In Figs. 108 and 109 I have constructed the Cubical 

 Hyperbolas for each arm, and shown the actual observations 

 by small circles. The agreement between theory and obser- 

 vation is as close as can be expected. 



Mr Nipher himself represents the observations empirically, 

 by means of an Equilateral Hyperbola, which, for the portion 

 of the curves under observation, does not differ materially 

 in shape from the Cubical Hyperbola, indicated by the Law 

 of Fatigue as the true form of the curve. 



2 H 



