282 VETERINARY PHYSIOLOGY 



Accessory substances are destroyed by prolonged heating, 

 so that they are for the most part absent in food stuffs that 

 have been boiled. 



Animals receiving green stuffs are not likely to suffer 

 from the lack of these accessory factors. The exclusive use 

 of artificially-prepared feeding stuff's which have been heated 

 in the course of their manufacture may, however, produce 

 malnutrition and arrest of development. 



These accessory factors have been given the name of 

 " vitamines," an unfortunate title, since we do not know if 

 they are amines or what they have to do with life. 



