COMPOSITION TABLES 345 
The tables showing the average fertilizer ingre- 
dients of fodders and feeds are also subject to the 
same criticism, although not to the same degree. 
These data are of special service, in the case 
of farm crops, in showing the relations between 
the different classes, and, in the case of fine feeds 
(which are not forage-crop products), in indicat- 
ing the gains or losses that may be incurred in 
the exchange of home-grown herbage feeds for 
the more concentrated refuse or by-products. 
The average coefficients of digestibility are also 
subject to variations, as must be apparent to 
those who give the matter consideration. They 
are to be used as guides only, and not as absolute 
facts. 
The data contained in these various tables 
have been derived from a number of sources, but 
mainly from tabulations of analyses made by the 
various experiment’ stations of this country. The 
coefficients of digestibility are the averages of 
American digestion experiments contained in the 
report of the Hatch Experiment Station of Massa- 
chusetts, for 1906. 
PLAN OF TABLES I AND IL 
1. Green fodder, pp. 347, 358. 
A, Cereals and grasses. 
B. Legumes. 
C, Combination crops. 
D. Miscellaneous. 
