34 APPLIED PHYSIOLOGY 



they do not add to the strength of the body, but only 

 benumb its tired feelings. A substance which causes the 

 body to do more work without giving extra strength is 

 called a stimulant. The old Romans called an ox whip a 

 stimulus. So a stimulant is anything which acts like a 

 whip. 



62. How much food ? In all, about one fourth of a 

 pound of albumin, and a little more than a quarter of 

 a pound of starch, and a little less than a quarter of a 

 pound of fat should be eaten each day. What food 

 shall we select to furnish these substances ? Men live 

 upon every kind of food, but some foods are better than 

 others. This bill of fare for the day will give the right 

 quantity of food : 



i Ib. of meat, or eggs, or fish ; 2 oz. of butter ; 



\ Ib. of bread; 3 pints of water; i^ pints of milk. 



SUI&MARY 



1. All animal food contains a good quantity of albumin 



and fat, and but little starch or sugar. 



2. Vegetable foods contain albumin, but it is much harder 



to digest than the albumin of animal food. 



3. Vegetable food contains some oil, but this is scarcely 



digested at all. 



4. Vegetable food contains a very large quantity either of 



starch or of sugar. 



5. The best bill of fare contains animal food to supply 



the albumin and fat, and vegetable food to supply 

 the sugar or starch. 



6. Salt is the only mineral substance which needs to be 



added to food. 



7. Almost any kind of water can be made safe for drink- 



ing by boiling it for ten minutes. 



