38 



Experiments has been published; after which the 

 subject may be re-considered. 



Soil samples should probably be again systematically 

 taken at the conclusion of the current rotation that is 

 in the autumn of 1891, after the removal of the wheat, 

 or, if not then, at the conclusion of the next rotation ; 

 for the determination of total nitrogen in the surface 

 soils, and of nitric acid, and perhaps chlorine, in the 

 subsoils to a considerable depth. 



Independently of the numerical record of the crop- 

 results given in the " Memoranda " as above referred to, 

 and occasional illustrations drawn from them, or from 

 the analytical results, embodied in various papers, the 

 Rotation results as a whole have not been published. 

 They have, however, been arranged, studied, and pretty 

 fully discussed, in 8 of my Oxford Lectures. This dis- 

 cussion includes that of the Field results, the composi- 

 tion of the crops, and the soil results ; and, so far as 

 the composition of the crops is concerned, the results of 

 the 60 complete ash-analyses, as well as some others, 

 have been applied. The arrangement, study, and dis- 

 cussion herein involved, is supposed to provide the 

 basis for a systematic paper on the whole of the Rota- 

 tion results, both crop and analytical ; and it is believed 

 that such a paper will prove to be of great interest and 

 importance. It is not intended that any resume of this 

 discussion shall appear before the full paper is published. 

 Such a resume may, however, afterwards be given in the 

 series of my Cirencester Lectures ; and it is supposed 

 that the main results will also afterwards be given in 

 the proposed publication of the series of subjects 

 embodied in the Oxford Lectures. 



VIII. THE EXPERIMENTS ON THE MIXED HERBAGE OF 

 PERMANENT GRASS-LAND. THE PARK. 



1. The Field Results. 



The majority of these experiments were commenced 

 in 1856, so that the present season, 1891., is the 36th 



