ON MILK AND MILK-TESTING 3 



In what form does casein exist in milk? 

 In minute particles held in suspension. 



In what form does albumin exist in milk? 

 Albumin is in solution. 



How does the action of casein differ from that of 

 albumin? 



Casein is in suspension. It is precipitated by 

 rennet and acids. It is not precipitated by heat. 



Albumin is in solution. It is not precipitated by 

 rennet and acids, but is precipitated by a heat of 

 180° F. 



What is the composition of casein? 



Carbon 53-00% 



Oxygen 22.70% 



Nitrogen 1570% 



Hydrogen 7.00% 



Phosphorus ... .85% 

 Sulphur 75% 



100.00% 



What are the melting points of the important fats ? 



Olein 41° F. 



Palmatin 142° F. 



Myristin 129° F. 



These fats become oily when heated and solidify 

 on cooling, some fats sooner than others. 



What is the specific gravity of fat? 

 About .93. 



