Development and Maintenance. 11 



action is instituted, and new compounds are pro- 

 duced which are no longer useful to the body. 

 They are called effete materials, and after being 

 collected by appropriate vessels termed lymphatics, 

 are by them conveyed to special organs for the 

 purpose of being expelled. If retained, they 

 would prove highly detrimental to the body, and 

 even destructive to life. 



The waste of muscular tissue from work and 

 ordinary exercise is considerable, that substance 

 forming a great portion of the animal body. 

 It is constantly in need of fresh material to 

 restore or replace those parts which have been 

 removed by waste, and the elements necessary 

 are provided by the food, after undergoing im- 

 portant changes hereafter to be mentioned under 

 digestion. 



Such facts, briefly as they are detailed, and 

 divested, as far as practicable, of technicalities, 

 present most important points to view, and 

 enable us to direct particular attention to the 

 application and economising of material (food) 

 for the production of the greatest amount of 

 actual force strength and vigour in working 

 animals, or of fat in those destined for the 

 butcher. 



With these before us, the effects of some of 

 the modes in which animals are kept, will be 

 clearly understood. 



Under the subject of development it has been 

 stated the process is confined to intra-uterine 



