EXERCISE OF THE KNEES. 49 



should not be affected by this exercise, but 

 be kept steady in the same position. 



Of the knees. The strength of pressure 

 of the knees will be judged of, and even 

 obtained, by the aid of the following me- 

 thod : this, which at first sight will perhaps 

 appear of slight importance, will, neverthe- 

 less, bring about great results. The in- 

 structor will take a narrow piece of leather 

 about twenty inches long; he will place one 

 end of this strap between the pupil's knee 

 and the side of the saddle. The pupil will 

 make use of the force of his knees to pre- 

 vent its slipping, while the instructor will 

 draw it towards him slowly and progress- 

 ively. This process will serve as a dyna- 

 mometer to judge of the increase of power. 



The strictest watch must be kept that 



each force which acts separately does not 



put other forces in action, that is to say, 



that the movement of the arms does not in- 



5 



