45 



reasons, it was finally abandoned after the bean crop of 

 1878. 



The numerical results of the Field experiments 

 have net been published; but a general statement is 

 given in the "Memoranda" As there stated, the 

 remarkable result was obtained that, without nitrogen- 

 ous manure, nearly as much wheat, and nearly as much 

 nitrogen, were yielded in 8 crops of wheat grown in 

 alternation with the highly nitrogenous beans, as in 10 

 crops of wheat grown consecutively over the same 

 seasons, in another field ; and also nearly as much as 

 were obtained in a third field, in 8 crops of wheat 

 alternated with bare fallow. Further, the yield of 

 nitrogen in the 8 intermediate crops of beans was, with- 

 out manure not much less, and with mineral manure 

 more, than in the wheat alternated with them. 

 Thus, as compared with the effects of bare fallow 

 on the yield of nitrogen over a given area, that 

 obtained in the beans was almost entirely clear gain ; 

 and the results as a whole afford a striking illustra- 

 tion of the influence of the interposition of Leguminous 

 with Gramineous crops, in augmenting the yield of 

 nitrogen over a given area of land. 



Samples, of both corn and straw, of both the wheat 

 and the beans, were always taken, the percentages of 

 dry matter and of ash determined in them, and the 

 ashes preserved. In selected cases, in the earlier years 

 of the experiment, the nitrogen was also determined, in 

 the corn and in the straw, of both crops. 



In the autumn of 1857, after the removal of the 

 fourth crop of wheat, surface soil-samples, to the depth 

 of 9 inches, were taken from 4 places on each of 4 

 of the 10 plots ; and at the same time similar samples 

 were taken from 4 plots in the same field, respectively 

 somewhat corresponding in manurial history, but where 

 the Leguminous crop, beans, had been grown year after 

 year without the interposition of wheat. Again, in the 

 autumn of 1865, after the removal of the 8th crop of 

 wheat (alternated with beans), samples were taken from 

 the same 4 plots, and also from the 4 corresponding 



