


AVAILABILITY AND FUEL VALUE OF FOOD MATERIALS. Q7 
The number of analyses in this comparison might be largely 
increased, but it is believed that a sufficient number have been 
taken to show the agreement between the computed and deter- 
mined values. ‘The method of computing the heat’ of combus- 
tion of the different materials was as follows: In a sample of 
wheat bread, for example, the water-free substance contained 
14.8 per cent. protein, 2.9 per cent. fat, and 80.2 per cent. 
carbohydrates, and had a heat of combustion, as actually deter- 
mined, of 4.529 calories per gram. One gram of the water-free 
material contains, therefore, .148, .029, and .802 grams of pro- 
tein, fats, and carbohydrates respectively, and its heat of com- 
bustion as computed from the factors given in Tables 6, 7, and 
m would be (.149 X 5:80 + .029 X 9.30 + .802 X 4.20 =) 
4,502 calories per gram. All of the comparisons have been 
made on the basis of the water-free material. 
TABLE 9. 
Comparison of heats of combustion as calculated by use of the 
above factors with results found by actual experiment. 


{ 
Number | AvG. HEAT OF COMBUSTION | Calculated 



of PER GRAM OF feauite in 
KIND OF Foop MATERIAL. | ese | WATER-FREE SUBSTANCE. | Percentages 
Pave | Determined. | Calculated. determined. 
Calories. Calories. % 
Beef, - - eee wire ae NaS 6507 6619 10ne7 
Beef, canned, - A % 7 6197 6268 TOP S23 
Mutton, - : = . TON | 7146 | 7316 102.4 
Pork, 7 : a = IO 7835 7944 101.4 
Poultry) - - : - Bees 6310 / 6508 TOs 5! 
Fish, - ~ = z 3 6317 | 6427 101.8 
Eggs, “ : # - LOreys)| Plies | 7160 100.8 
Butter,” - - > - 20 8832 | 8g18 IOL.O 
Milk, - - - Sy Spne 5437 | 5413 99.6 
’ Breakfast foods, - “ 3 43067 | 4360 99.8 
Bread, crackers, etc., 2 36 4536 . 4513 99.5 
Corn (maize) meal and corn ) 4 4580 | eos apf 
preparations, - - J | ; 
Rye preparations, - - 6 4353 | 4343 99.8 
Barley preparations, = hig? 4352 | 4365 100:3 
CLOG SS a 5 4390 4474 TOL. 
Oatmeal (rolled oats), : 2 4834 | 48IL 99.5 
Oatmeal, cooked, - - 6 4488 | 4480 99.8 
Wheat, pastry, = = 8 4579 4605 100.6 
Legumes, fresh, - 3 8 4367 | 4361 99.9 
Legumes, cooked, - : 5 A312 | 4343 100.7 
10 6 
3 
2 
se 
4 

Vegetables, fresh, - - 4195 4051 96. 
Vegetables, cooked, - s 4057 | 4277 105.4 
Vegetables, canned, - - 4264 4102 96.2 
Fruits, fresh, - ‘ - 4389 4123 93.9 
Fruits, canned, - = A077 So 2 4056 99.5 
Average 276 samples, - : -——- — 100.3 




