123 



Again, the variation in the stock independent of the grain is shown 

 by the measurements of the dimensions of the heads and stocks as 

 given in the folk)wing tabh^s : 



OATS (FITTBOr.KN'S RXPEKIMENTS). 



SUMMER WHEAT ( HABERLANDTS EXPERIMENTS). 



Similar experiments by Sorauer (1873) give results analogous to 

 the preceding. He measured the greatest length and width of the 

 leaves, at several stages of their growth, of barley plants in tubs of 

 dilferent moistures, with the average results for all stages of growth, 

 showing that the leaves were longer and broader the more watei- was 

 furnished, while the available nutrition remained the same. 



BARLEY (SORAI^ERS KXl'EItl MEXTS). 



These and similar observations show that the assimilating organism 

 of the plant (viz, its leaves), as also its organism for absorl)ing nutri- 

 tion (viz, its roots), both alike increase with the increase in avail- 

 able moisture near the roots in the earth, at least within the limits 

 existing in these experiments, and to the same extent is the develop- 

 ment of the plant favorable to the increase of its productivity. 



