FOOD 1 19 



necessary and just enough protein for the building ma- 

 terial. If such a balanced diet is eaten, the excretory 

 organs of the body will not have so much work to do 

 and so will remain healthy. Such a diet will also lead to 

 a more nearly perfect health of the entire body. 



The white of a hen's egg is almost pure protein and 

 water. When the white of an egg is heated it becomes 

 solid; such a process is known as coagulation. Coagula- 



BEEF IN COLD STORAGE 



tion is the process of changing protein from a semi-liquid 

 form to a solid. Clotting of the blood is a form of coagula- 

 tion. The protein in the blood called fibrin forms 

 a solid stringy material and encloses the red and white 

 corpuscles. Casein is the coagulated protein of milk, 

 out of which cheese is made. Gluten is the protein of 

 wheat. It can be obtained by chewing whole wheat 

 grains for several minutes and making no effort to swal- 

 low. The gummy substance left in the mouth is largely 

 gluten. Gluten can also be obtained from flour by 

 taking a tablespoonful of flour and wrapping it in a 



