60 THEORY OF EXERCISE. 



The chief lesson, as far as stable management is concerned, 

 which we learn from the foregoing considerations, is that the 

 more severe the exercise or work, the greater is the necessity 

 for keeping the excretory organs in healthy action, and for 

 supplying the animal with pure air and plenty of good 

 drinking water. The skin is the only one of these organs 

 which we can safely stimulate artificially for a prolonged 

 period, and then only by grooming and by a moderate 

 amount of clothing. 



