ANIMAL MECHANICS. 



453 



effect diminishes as the weight increases, and becomes infinite 

 when the weight is zero. There is, therefore, no true maxi- 

 mum of effect in these experiments. 



Second Illustration of Law of Fatigue. — 1 shall take my 

 second illustration of the Law of Fatigue from experiments 

 similar to those described (pp. 24-44), from which I obtained 



Fig. 103. 



my first view of the Law. The experiments consist in hold- 

 ing out the arm, horizontally, either unloaded, or carrying 

 weights in the palm of the hand, held upwards, and noting 

 the time during which the arm could be held out horizontally. 

 The following results are the means of many observations 

 made on myself, and include those before described 



