136 THE GRASSES— CHEMICAL ANALYSES. 



of the United States compiled by the United States 

 Department of Agriculture. A study of the tables 

 given in the above-named report shows clearly that the 

 composition of the plant varies according to difference 

 of soil, situation, climate, time when cut, and general 

 environment, — so that the publication of chemical 

 analyses is of little use unless accompanied by de- 

 scriptions setting forth all above particulars. The 

 conclusion the compiler of the report arrives at is, to 

 use his own words : " Species are not in themselves 



AT ALL FIXED IN THEIR COMPOSITION, THERE BEING AS 

 LARGE VARIATIONS AMONG SPECIMENS OF THE SAME AS 

 BETWEEN SPECIMENS OF DIFFERENT SPECIES." For in- 

 stance, in the case of Timothy grass, procured from 

 different localities, the undernoted will show a wide 

 margin of difference in some of the most important 

 constituents of the plant. 



Analyses of Timothy Grass. 

 (Cut in full bloom.) 



