F. KiDD AND C. West 169 



tends to disappear or even to be reversed. This result may be significant, 

 but it must be remembered that while the yield per plant in the case 

 of the mature seeds represents an average based on a whole population 

 (i.e. both vigorous and weak plants), the yield per plant in the case of 

 the immature seeds, on the other hand, probably represents an average 

 based on the more vigorous members of the population only, the others 

 having perished during storage in the seed stage. 



From the point of view of the grower seed harvested at a stage 

 somewhat previous to maturity may, under certain conditions, give a 

 better yield than seed allowed to become dead-ripe upon the parent- 

 plant; but it must be borne in mind that immature seed does not 

 withstand storage as w^ell as seed which has been allowed to become 

 fully ripe, so that — as a general practice — the use of immature seed is 

 not to be recommended. 



{To be cont indued.) 



Literature Cited. 



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Univ. of Wisconsin Agric. Expt. Sta., Research Bull. 22, 1912. 



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Finding's Landw. Ztg. 55, No. 17, 1906, pp. 583-591. 



(9) Geokgeson, C. C, Burtis, F. C. and Shelton, W. Experiments with Oats, 



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