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 
p 
iD OD 
Sur cover’ 
Smaltseeded altalls dodder Largeseeded alfalls dodder 
at ° 
° 
hae) 
ox. 
10 Lambs quarters 11 Spreading amaranth 12° "Green fextail 
Fic. 74. — Some weed seeds commonly found among Alfalfa seeds. En- 
larged and natural size. Adapted from Farmers’ Bulletin 495, U. 8. 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. 
