(roots and leaves), are entirely removed, and on the other 

 half they are either consumed on the land by sheep, or 

 cut, spread, and ploughed in. All the other crops are 

 entirely removed from the land. Excepting in the first 

 course of 4 years, when clover was grown as the third 

 crop over the whole of each plot, in the third year one 

 half of each has grown a Leguminous crop (clover or 

 beans), and the other half has been left fallow. 



Thus, each of the 3 differently manured plots is divided 

 into 2, so far as the treatment of the turnips is concerned, 

 so making 6 ; and each of these is again subdivided in 

 the third year, one part growing a Leguminous crop, and 

 the other being fallow, thus making in all 12 plots. 



The crop results of these 12 plots, in each of the 43 

 years now completed, are recorded in the " Memoranda '' 

 up to date. 



2. The Composition of the Rotation Crops. 



Each year samples of the roots and leaves, or the corn 

 and straw, or of the clover crops, are taken. Portions 

 of each are partially dried and preserved, for nitrogen or 

 other determinations ; and portions are fully dried, the 

 dry matter determined, and then burnt to ash, the ashes 

 being preserved. 



Very many nitrogen determinations have been made 

 in the produce, sometimes in individual samples, some- 

 times in " mixed-plot," and sometimes in " mixed-year " 

 samples. Sixty complete ash-analyses have also been 

 made; chiefly in "mixed-plot" or in "mixed-year" 

 samples. 



3. The Soils of the Rotation Plots. 



In 1867, samples were taken from each of the 12 

 plots, at 4 places on each plot, and in each case to the 

 depth of 3 times 9 or 27 inches; and the nitrogen by 

 soda-lime has been determined in the mixed sample 

 from the four holes, for each plot, and for each 

 depth. 



In 1874, samples were again taken from each plot, at 

 3 places on each, and in each case to the depth of 3 



