continuous bean plots ; this time to the depth of 

 3 times 9 inches, or in all to 27 inches. In all these 

 samples the nitrogen (by soda-lime), has been deter- 

 mined, but none of the results have yet been published. 

 They will probably be most appropriately discussed in 

 connection with the subject of the experiments with 

 Leguminous crops taken as a whole. 



In addition to the above, surface-soil samples were 

 taken in 1883, 5 years after the discontinuance of the 

 experiments both with beans grown continuously, and 

 with beans and wheat grown in alternation, and some 

 were also taken in 1885. In all the nitrogen by soda- 

 lime, and in some the nitrogen as nitric acid, has been 

 determined; and a selection of the results has been 

 published. (See No. 67, p. 404; No. 77, p. 21; and 

 No. 81, p. 29.) 



XI. EXPERIMENTS ON BARLEY AND CLOVEK, IN LITTLE 

 HOOSFIELD. 



These experiments are of considerable interest, but 

 they also have been conducted in a field not set apart 

 for continued investigation. 



The field had grown 5 corn crops in succession 

 (1 Wheat, 1 Oats, and 3 Barley), the first without any 

 manure, and the last 4 with artificial mineral and nitro- 

 genous manures, but without any farmyard or other 

 organic manure, up to 1871 inclusive. In 1872 barley 

 was again grown, with artificial mineral and nitrogenous 

 manures ; but now the field was divided, and clover sown 

 with the barley on one half. In 3873 barley was again 

 grown on the one half, but clover on the other. The 

 barley yielded 37'3 Ibs. of nitrogen per acre, but the 

 three cuttings of clover contained. 151'3 Ibs. In the 

 next year, 1874, barley was grown on both portions, and 

 on the one where barley had, in the previous year, yielded 

 37'3 Ibs. of nitrogen, it now yielded 391 Ibs. ; but, on 

 the portion where clover had yielded 151 '3 Ibs. of 

 nitrogen, the barley succeeding it now yielded 6 9 - 4. 

 That is to say, the barley yielded 30 '3 Ibs. more nitrogen 



