THE HYGIENE OF THE DINING ROOM 75 



foods arranged in order of cheapness are : cereals, dried beans, 

 potatoes, peanuts. It is thus seen that cereals and dried 

 beans are the cheapest foods from both standpoints. 



LABORATORY EXERCISE n 



Purpose. To find out which are the cheapest foods and 

 which are the most expensive. 



Directions, i. Find the price per pound of the various 

 foods given in the table on page 71. If some, like oranges, are 

 sold by the dozen, weigh a few and from this compute the price 

 per pound. 



2. From these figures showing the price per pound, compute 

 for each food : (a) the cost of a pound of protein ; (b) the cost 

 of 1000 calories fuel value. For example, if the price of round 

 steak were 25 cents, divide 25 cents by .19 the per cent of pro- 

 tein. This gives $ 1.31 the cost of a pound of protein. To find 

 the cost of 1000 calories, divide the figure given in the last 

 column by 1000 and then divide the price per pound by this 

 number. For example, taking round steak again: 890-7-1000 

 = .89. 25 cents divided by .89 = 28 cents, the cost of 1000 

 calories. 



3. After you have worked out these results for all the foods, 

 answer the following questions from a study of the figures. 



Which are the seven cheapest protein foods ? 

 Which are the seven most expensive foods? Write them 

 down in order in the table given on page 76. 



4. Which are the seven cheapest foods for fuel value ? Which 

 are the seven most expensive? The remainder may be called 

 medium-priced foods. 



5. In general which are the cheaper foods, animal or vege- 

 table? 



6. Are there any foods which are found in both lists of cheap- 

 est foods ? Are there any found in both lists of most expensive 

 foods? 



7. Record your answers to the above questions in the fol- 

 lowing tabular form, showing relative cheapness of foods. 



