MIXED DIET. 173 



the boiling. Therefore only enough for one day's use should 

 be boiled at one time-. This should be placed in a clean cov- 

 ered vessel, and set in the ice-chest while still warm. 



Milk which is to be fed to infants and children should be 

 heated till it steams, thus avoiding danger from tubercle bacilli. 



Or if one uses tea and coffee, it is safer to content one's 

 self with these, and not drink much water till that which is 

 safe, as from deep wells, can be obtained. 



In hot weather, and especially for those who are engaged 

 in hard work, it has been found that a little oatmeal stirred 

 in the water is beneficial. Do not drink ice-water. 



When overheated avoid drinking much cold water. Ke- 

 peatedly rinse the mouth with cool water, and swallow very 

 little. This is the way trainers manage a horse at a race, and 

 it is sensible to treat man as carefully. 



Salts. Salts include many substances besides common 

 salt. They aid in the solution of various substances during 

 digestion arid in other processes. We cannot live without salt. 



Lime in the form of calcium phosphate and calcium car- 

 bonate is essential, especially in the bones and teeth. Iron is 

 associated with hemoglobin. 



Necessity of a Mixed Diet. Our experience, together 

 with the results of the experiments on animals, teaches that 

 we could not live long if fed on any one class of foodstuffs 

 alone. We must take a representative 6f each of the groups. 

 "\Ve have noticed that most of our foods already contain more 

 than one foodstuff. We so combine them as to get suitable 

 proportions. Thus we eat bread and butter (a small amount 

 of fat with a large quantity of starch and a little gluten), meat 

 and potato, crackers and cheese, pork and beans, egg on toast, 

 bread and milk, rice and fowl, macaroni and cheese ; they " go 

 well together," chiefly because they are complementary. 



In order to get enough nitrogen from bread alone, one 



