270 



VETEEINAEY HYGIENE 



digestible proteids as the result of cooking; it appears, 

 however, to increase the palatability of these foods. 



Hay infusions made with boiling water, extract the bulk 

 of the proteid matter which is very soluble in water. 

 ' Hay tea ' as it is now termed, has been used with other 

 substances as a milk substitute for calves and foals, but is 

 principally of use as a hospital diet. 



The boiling of calf food and that intended for the rearing 

 of foals by hand is no doubt essential, it is only natural that 

 the starch converting power of the pancreas of these young 

 animals should be very weak, and the cooking of starch 



Fig. 79. — Vertical Steaming Apparatus (Richmond & Chandler). 



(which is of course not a natural ingredient of their diet at 

 this early age), facilitates the action of the pancreatic juice. 



The boiling of linseed is essential in order to liberate the 

 mucilage ; this can be obtained by infusion but it is a much 

 slower process. 



The cooking of rape cake in order to destroy its hurtful 

 properties has been previously dealt with (p. 257). 



Parching is employed in India for the preparation of 

 barley. Mashes of bran are prepared with boiling water, 

 thoroughly incorporated, and allowed to stand until cool 



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