io6 THEORY OF FEEDING. 



The following results were obtained by Grandeau and 

 Leclerc from carefully made experiments on horses : 



Comparative amount 

 of food digested. 



At rest 1000 



Walking exercise ....... 1032 



At work, walking ....... 1007 



Trotting exercise ....... 976 



At work, trotting 973 



At work in cab ....... 959 



In ministering to the requirements of the system, we should 

 be careful to act in agreement with the order in which the 

 functions of nutrition stimulate each other. Thus, if the power 

 of taking up nourishment by the body be more or less in 

 abeyance from the effects of fatigue or illness, it would be 

 manifestly injurious to tempt the appetite or to excite the 

 digestion. On the contrary, the only safe procedure in such a 

 case will be to promote the removal of the cause of the func- 

 tional torpidity, and when that has been accomplished, the 

 healthy stimulation of digestion and appetite by the demands 

 of the tissues will put the animal machine into perfect working 

 order, supposing that the food and the manner of its supply 

 are suitable. To briefly illustrate this point, to which I shall 

 refer more fully later on, I may say that instead of forcing food 

 on a horse which is " off his feed " from overwork, and giving 

 him stimulants, it is much better to content ourselves with 

 allowing him a full supply of drinking water and some green 

 food or carrots, so as to facilitate the removal from his system 

 of the deleterious products that are the cause of his depression. 

 When they have been excreted, his tissues will demand 

 materials for repair, with the result of healthy general 

 stimulation. 



VARIETY IN FOOD. 

 The craving for change of food depends,, as a rule, on the 



