
STUDIES OF DIETARIES. 119 
In the study of the dietary of a family, boarding house, or 
boarding club, account is taken of the amounts, composition, and 
cost of all food materials of nutritive value in the house at the 
beginning, purchased during, and remaining at the end of the 
experiment, and of all the kitchen and table wastes. The acces- 
sories, as baking powder, essences, salt, condiments, tea, coffee, 
etc., though of interest from a pecuniary standpoint, are of 
practically no value as regards nutriments. The amounts of 
different food materials on hand at the beginning and received 
during the experiment are added; from this sum the amounts 
remaining at the end are subtracted. This gives the amount 
of each material actually used. From the amount thus obtained 
and the composition of each material, as shown by analysis, the 
amounts of the nutritive ingredients are estimated. From 
these are subtracted the amounts of nutrients in the waste, and 
thus the amounts of the nutrients actually eaten are learned. 
Account is kept of the meals taken by the different members 
of the family, and by visitors. The number of meals for one 
man, to which the total number of actual meals taken is eqttiv- 
alent, is estimated upon the basis of the potential energy, as 
has been done in previous investigations here. These energy 
equivalents, which are stated below, are somewhat arbitrary, 
and will require revision in the light of accumulating inquiry. 
Estimated relative quantities of potential energy in nutrients 
veqguired by persons of different classes. 
Man at moderate work, - - - - mS : “ 3 ie 
Woman at moderate work, - . 1 - : = 2 
Boy between 14 and 16, inclusive, - - 2 “ < : 
Girl between 14 and 16, inclusive, - - : 2 i 2 
Child between 10 and 13, inclusive, : - : : Z 
Child between 6 and g, inclusive, - : - . ats 
Child between 2 and 5, inclusive, - : = 3 P : 
Child under 2, - - . = 2 2 : me ee 
Ohm AU wd 
Two of the studies, Nos. 175 and 176, were somewhat excep- 
tional, as is explained in the special descriptions of the indt- 
vidual studies beyond. 
In each study the data regarding the kinds and amounts of 
food materials, the persons by whom they were eaten, and the 
number of days and meals, were sent to the Station at Middle- 
town, where the necessary computations were made. The 
