106 



PRINCIPLES OF 



P. V. 



The aids are to be proportionately applied, 

 according to the effect you mean to produce. 

 The greatest exactness, uniformity, and deli- 

 cacy is required in the execution. 



To give an idea of this, suppose a circle of 

 thirty yards diameter, and the number of cir- 

 cles that can be described within so large a 

 circumference. Just so many degrees of ope- 

 ration have those aids to perform. Even in 

 the centre, these aids, judiciously managed, 

 can turn the horse on three distinct and sepa- 

 rate pivots : — first, on his centre, or the point 

 directly under the seat of the horseman, in 

 which the fore feet take place of the hind, 

 and the hind of the fore -.—secondly, on the 

 fore feet, in which the fore feet keep their 

 ground, and the hind feet move round them : 

 — lastly, on the hind feet, which keep the cen- 

 tre, while the fore feet describe the circle. 



In walking a horse upon a circle of thirty 

 yards diameter, the delicacy of these aids is 

 not perceivable ; and yet, if there were none, 

 the horse would certainly work on a straight 



