SEED ANALYSIS 



75 



different parts of the bag or container, usually from the top, 

 middle, and bottom. From the sample from 2 to 5 grams are 

 weighed out, and the impurities and desirable seeds are then sepa- 

 rated, usually by means of a lens like the one in Figure 72. By 



CwrlecUocV 



UA. 



ust 



. 



mustard 



eCVpvevr , QVUU. 

 Uoataer dodder 



FIG. 73. Some weed seeds and fruits commonly found among Red Clover 

 seeds. Enlarged and about natural size. From Farmers' Bulletin J[55, 

 U. S. Dept. of Agriculture. 



dividing the weight of the desirable seeds and the weight of the 

 impurities by the number of grams analyzed, the percentage of 

 each is obtained. Thus, if 5 grams are analyzed and the weight 



A Q 



of the desirable seeds found is 4.8 grams, then -- = 96 per cent, 



5 



which is the percentage of purity. In determining the kinds of 



