23 



instead of only one to each description of plant still 

 kept under experiment. The number of different 

 plants will thus be reduced from 14 as originally, to 8 

 or to only 7. The plan will, however, not be fully 

 developed until 1892, or perhaps a year later. 



The samples of produce taken will probably not be 

 much, if at all, reduced, at any rate for some years, as 

 an essential point of interest in the experiments is, to 

 estimate the yield of nitrogen over a given area, by the 

 different descriptions of plant, with their different 

 habits of growth, root-range, &c. 



The Soils of the Hoosfield Leguminous Crop Plots. 



The very remarkable results obtained in these 

 experiments led to the sampling of the soils of some 

 of the plots to a considerable depth in fact, to 

 a greater depth than had been adopted in the case 

 of any of the other experimental fields. In March 

 1881, samples were taken in 5 places on the land 

 where the clover had previously grown, and where 

 no nitrogenous manure had been applied from the com- 

 mencement, and in each case to the depth of 3 times 

 9 inches, or 27 inches in all. At the same time, similar 

 samples were taken from the immediately adjoining 

 land which had been devoted to the growth of the 

 Gramineous crop wheat, alternated with fallow, with- 

 out any manure, for almost exactly the same period 

 (nearly 30 years), during which the trials with red 

 clover had been made. 



In July 1882, after the removal of the crops, 

 samples were taken from the Trifolium repens, and the 

 Melilotus leucantha plots, in each case to the depth 

 of 6 times 9 inches, or in all to 54 inches. 



In July 1883, samples were taken from the wheat- 

 fallow, the Trifolium repens, and 2 Vicia sativa plots, 

 now in each case to the depth of 12 times 9 inches, or 

 108 inches. 



