STUDIES OF DIETARIES. 175 
been done in previous investigations here.* These energy equi- 
valents, which are stated below, are somewhat arbitrary, and 
require revision in the light of accumulating inquiry. It has 
seemed best, however, to use the same figures here as in the 
previous reports and postpone the change until. these dietaries 
may be summarized with others in a later publication. 
Estimated Relative Quantities of Potential Energy in Nutrients Required by 
Persons of Different Classes. 
Man at moderate work, - ‘ - - - = - 10 
Woman at moderate work, - - 4 = - - - 8 
Child, 15 to 6 years old, . - = - - - - 7 
Child, 6 to 2 years old, - - - - - - - 5 
Child, under 2 years old, - - - - - - - 214 
EXPLANATION OF TABLES. 
The figures in the first table of each dietary (EanICS 25.355 hen 7s 
59 and 61), giving the actual amounts‘of food and of nutrients 
in the food used during the dietary, are based upon the weights 
of the food materials as they were purchased and used; that is, 
they include bone and other refuse, except where specified. 
The first three columns in the table contain the percentages of 
protein, fat and carbohydrates used in computing the amounts of 
those nutrients in the different food materials. In all cases where 
the composition was not fairly well known from previous analyses, 
specimens of the food materials actually used in the dietary, or 
specimens as nearly identical as possible, were analyzed. The 
cases in which special analyses were made in connection with 
these dietaries are indicated in the table by placing the letter a 
after the name of the material. The weights of the water-free 
table and kitchen wastes, and their composition, are given in the 
last line of the table. Exactly what is included in these wastes 
is explained in the foot note on page 97 of the Report of this 
Station for 1891. 
The third (last) table in each dietary (tables 54, 56, 58, 60 and 
62) gives the nutrients and potential energy in food purchased, 
in table and kitchen wastes, and in the portion actually eaten. 
The estimates of animal and vegetable nutrients in the waste are 
computed as below described, and those of potential energy (fuel 
value of nutritive ingredients) as explained in an earlier Report. 
Table 63 summarizes the results of the thirteen dietary studies 
which have been made by the Station. 
* See especially 17th Annual Report of the Massachusetts Bureau of Statistics of Labor 
PP. 239-329. 
+ Report of this Station, 1890, p. 174. 

