350 



THE POPULAR SCIENCE MONTHLY 



2 small chops (lamb or 



fresh pork) 2 36 



French fried potatoes ... 2 22 



2 slices bread 1 



with butter 2 28 



1 cup coffee 



Cream and sugar i 2.5 



Two slices dry toast 2 26 



Butter 1 0.5 



Large serving ham 2 66.0 



2 eggs 2 64 



1 cup coffee 



Cream and sugar | 2.5 



Total 950 calTlZgTs" 



Total 1,150 cal. 133.5 



Luncheon 

 Plate of baked beans .... 3 

 with small piece fat pork 2 

 4 slices bread and butter . 6 



Rice pudding 2 



Cup of tea with sugar ... i 



Luncheon 



63 3 sandwiches 6 56 



28 with cold boiled ham 



56 (cut very thin) 1 28 



16 2 crullers 4 24 



1 pint whole milk 3 57 



Total 1,350 cal, 163 



Dinner 

 Large plate cream of 



celery soup 1 



Large serving rump roast 



beef 3 



Large serving macaroni 



and cheese 3 



2 large spoonfuls creamed 



mashed potatoes 2 



Side dish stewed tomatoes 

 Bread (2) and butter (1) 

 2 small baked apples .... 



with cream and sugar . . 

 Ordinary piece sponge cake 



16 



180 



53 



Total 1,400 cal. 165 



Dinner 



Clear tomato soup 



Large serving sirloin beef- 

 steak 2 60 



Large serving rice 2 20 



2 large sweet potatoes ... 4 24 

 Side dish stewed onions . . 1 12 



3 slices bread and butter . 4 42 

 1 dish tapioca pudding ... 2 1 

 Cup tea and sugar i 



Total 1,550 cal. 159 



Grand total 3,900 cal. 503.5 



with 13 per cent, of total in protein. 



Total 1,750 cal. 322 



Grand total 4,250 cal. 618";5" 



with 14.5 per cent, of total in protein. 



That this energy-giving quality of foods is the most important 

 function wliich they serve is apparent at once when we discover tliat at 

 least four fifths of the dry weight of our food serves no other purpose 

 than that of giving lieat. The heat comes from the oxidation of our 

 food and since the temperature of the air ahout us is nearly always 

 lower — in winter very much lower — than hlood heat, we are practically 

 always losing heat hy radiation and conduction. ]\[crcly to keep up the 

 hody temperature to 98° F., the temperature at or near which the living 

 substance best performs its functions in every animal, is the purpose of 

 the great mass of fuel which we are obliged to "supply" every day 

 of our lives. To furnish the energy for the muscular work which most 

 of us do requires relatively little and, strangely enough, to sujijily brain 

 energy — intellectual energy, alertness and other purely psycliic qualities 

 — apparently requires no energy at all in the sense in which we have been 

 using that term tluis far. Experiments have been conducted on college 



