96 STORRS AGRICULTURAL EXPERIMENT STATION. 

tabulated. It is of course to be understood that these factors, 
like those for protein and fats, are simply tentative, based upon 
the best data we have been able to obtain. 
TABLES. 
Average determined heats of combustion of different carbohydrates 
and assumed factors for carbohydrates of different groups of 
Jood materials, 







HEAT OF COMBUSTION 
PER GRAM. 
KIND OF MATERIAL. 
: | Assumed 
Determined. | or calculated. 
Calories. | Calories. 
Pentoses, - 2 2 - - - “ 4 3.72 to.4.38 — 
Dextrose, - = 2 - " = . a 3.75 ima 
Levulose, - Paha é x = 3.796 a 
Cane sugar, = = - : - - - 3.96 — 
Milk sugar, - - - - - - - 3.86 = 
Cellulose, - - os 3 Ss » © AG26 —_ 
starch, é 4 - = = - : - 4.20 — 
Dextrin, - - s - = - - 4.11 —_— 
Glycogen, - - - - - - - - 4.19 _ 
Carbohydrates of animal foods, meats, dairy pro- ) 
ducts, etc., - - - - - = 6. aoe 
Carbohydrates of'cereals, - - - - - — 4.20 
Carbohydrates of legumes, - - - - sa 4.20 
Sugars,  - * = = : < - - — 3.95 
siarches. = - a = = 2 - : — 4.20 
Carbohydrates of vegetables, - . - - — 4.20 
Carbohydrates of fruits, - - - - - —— 4.00 

TESTS OF ACCURACY OF PROPOSED FACTORS FOR HEATS OF 
COMBUSTION. 
The figures of Tables 6, 7, and 8, taken in connection with 
the percentage composition of any given food material, enable 
us to compute its heat of combustion. If the heat of combus- 
tion has been actually determined by the bomb calorimeter 
it gives a means of testing the accuracy of the factors thus 
assumed. Many analyses of food materials in which the heat 
of combustion was determined are available for this purpose. 
A large portion of these have been made in connection with 
the investigations upon the food and nutrition of man carried 
on under the auspices of the United States Department of 
Agriculture, in codperation with this and other experiment sta- 
tions and educational institutions. /Table 9 shows the computed 
and determined heat of combustion in 276 samples of food 
inaterials, 220 of which were analyzed in this laboratory and 
the remainder by Prof. Grindley of the University of Illinois. 

