THE FARMER'S INTEREST IN GOOD SEED 29 



Silene stellata (Catchfly) 900 



Thalictrum purpurascens (Meadow-rue) 496 



Trifolium hybridum (Alsike Clover) 1,604 



Tri folium pratense (Red Clover) 662 



Trifolium repens (White Clover) 1,904 



Verbena stricta (Vervain) 1,028 



Verbena urticaefolia (Vervain) 2,408 



Mr. J. R. Campbell has kindly worked out the following 

 formula for determining the percentage of impurities in 

 some of the different agricultural seeds. A table is here- 

 with appended giving the number of s ( eeds in one per 

 cent of one teaspoonful or 5 grams of clover seed, and 

 one per cent of one teaspoonful or 4 grams of timothy 

 seed. 



Analysis of Seed (Approximate). In making an analy- 

 sis of red clover or any other seed, the sample should 

 be thoroughly mixed. If we have a sack of seed, a hand- 

 ful should be taken from the top, another from the middle, 

 and another from the bottom of sack. Mix them in a 

 pasteboard box, plate or anything handy ; then take a 

 pinch here and there until we have a slightly rounding 

 teaspoonful. (Use common tin teaspoon.) Do not have 

 it more than slightly rounding or the figures will be inac- 

 curate. 



Pour this out on a sheet of white paper, or glass, and 

 with the aid of a toothpick, lead pencil or anything con- 

 venient, separate the good clover into one pile and the 

 weed seed and dirt into another. Then with the help of 

 the manual in identification, separate the different weed 

 seeds and count them. Next find the percentages of each, 

 using the table for this purpose. For example, s,uppose 

 there are 120 seeds of crab grass and 16 seeds of buck- 

 horn. The table says 182 seeds of crab grass are equal 

 to I per cent. Therefore 120 seeds equal 12 %s2 of I per 

 cent, or .659 per cent, and since 57 seeds of buckhorn 

 equals I per cent, r6 seeds equal a % 7 of I per cent, or .28 



