144 



MILK HYGIENE 



the advantage only when it is a question of keeping the 

 milk a long time or transporting it a long distance, and 

 in this case the principle followed is essentially the 



FlQ. 11. 



Section, to show coDstmction of apparatus Bbown In Fig. 10. a, entrance for milk; t>, 

 exit for milk ; c, steam-ctiamber ; d.steamopening ; e, safety-valve. 



same as that followed in the preparation of preserves in 

 hermetically sealed cans. Considerable advance has 

 been made in recent years in regard to the prepp,ration 



