76 



SEEDS AND FRUITS 



impurities and their percentages it is not enough to separate the 

 impurities and desirable seeds, but the kinds of impurities must 

 be identified, separated, and the weight necessary for finding the 

 percentage of each must be separately determined. In this kind 



10 lamb's quarters 



Grew fate ft 



FIG. 74. Some weed seeds commonly found among Alfalfa seeds. En- 

 larged and natural size. Adapted from Farmers' Bulletin 495, U. S. Dept. 

 of Agriculture. 



of analysis, the operator, unless he is well acquainted with the 

 various kinds of seeds, should have at hand for comparison 

 samples or figures of the seeds of weeds and other plants likely 

 to occur among the seeds which are being analyzed. Samples 

 are better, but figures as shown in Figures 73 and 74 may serve 

 quite well. 



