268 PASTORAL AND AGRICULTURAL BOTANY 



6. South American (Chili. Argentine Republic) CeratoMoa australis, 

 Medicago denticulata, M. maculata, Melilotus parwflora, Ammi visnaga, 

 and Cuscuta racemosa. 



Number of Seeds in Pound and Bushel.- The number of weed seeds 

 sown with agricultural seeds is astonishing. In one sample, that con- 

 tained in all only one-fifth of one per cent, of spurious seeds, the number of 

 weed seeds per pound averaged 990. In a bushel of 60 pounds there were, 

 therefore, more than 59,000 weed seeds. A sample of clover seed offered 

 on the Chicago market in 1898 for two cents per pound contained 338,000 

 weed seeds per pound, or more than 20,000.000 per bushel. Hence, we 

 are led to observe that low-priced seed may be expensive, when we con- 

 sider, that it costs just as much to prepare the soil for poor seeds, as for 

 good seeds, and if the seeds are poor the amount of labor later exerted in 

 the extermination of the weeds more than offsets the initial expense of 

 the seeds. Hence the farmer should grow the best seed that he can obtain 

 on the market, even if the price is high. 



Slowly, but none the less surely, America is becoming the recognized 

 center of the world's seed-growing industry. The need, therefore, of 

 men scientifically trained in all phases of this industry is important for 

 the future development of the seed industry. Whoever contributes to 

 the education of these men contributes to the welfare of the state. 



, BIBLIOGRAPHY 



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September i, 1877. 

 BEAL, W. J.: Seeds of Michigan Weeds. Bulletin 260, Michigan State Agricultural 



College Experiment Station, March, 1910; Seed Dispersal. Boston, Ginn & 



Company, 1900. 

 BRENCHLEY, WINIFRED E.: Buried Weed Seeds. Journal Agricultural Science, ix, 



1, 1-31, 1918; reviewin Journal Royal Horticultural Society, xliv, 164, May, 1919. 

 BROWN, EDGAR: Alfalfa Seed. Farmers' Bulletin 194, 1904. 

 BROWN, EDGAR and HILLMAN, F. H.: Seed of Red Clover and Its Impurities. Farmers' 



Bulletin 260, U. S. Department of Agriculture, 1906. 

 CLARK, GEORGE H.: The Seed Control Act (Canadian). Bulletin No. S.i, Revised 



Edition, Dominion of Canada, Department of Agriculture, July, 1907. 

 DAILEY, ARTHUR T.: Seed Separation and Germination. Facts for Farmers, iii, No. 9, 



May, 1913. 

 DUVEL, J. W. T.: The Vitality and Germination of Seeds. Bulletin 58, Bureau of 



Plant Industry, U. S. Department of Agriculture, 1904. 

 GUPPY, H. B.: Studies in Seeds and Fruits. An Investigation with the Balance. 



London, Williams and Norgate, 1912; Plants, Seeds and Currents in the West 



Indies and Azores. London, Williams and Norgate, 1917. 



