42 



Transactions," No. 50 (1880), and No. 61 (1882). 

 The first of these papers (Part I) treated specially of 

 " r flie Agricultural Results," but involved the use of 

 some of the chemical and some of the botanical data 

 also. In the second paper (Part II) " The Botanical 

 Results " were given and discussed in detail. In these 

 papers it is stated that the Chemical Eesults will be 

 given in a Third Part. This Third Part has not yet 

 been published, but the chemical results have been to a 

 great extent arranged, studied, and discussed, so far as 

 was suitable, in my Oxford Lectures ; and it is assumed 

 that this arrangement, study, and discussion, will serve 

 as a basis of a systematic paper constituting "Part III, 

 The Chemical Results." It may be added that the dis- 

 cussion in question includes that of the results of the 

 numerous complete ash-analyses above referred to. 

 Although Parts I and II related mainly to the results 

 of the first 20 years, Part III, which it is hoped will 

 soon be ready for publication, must necessarily include 

 those of later date. It will, indeed, probably include 

 many results up to 1889, and some to 1890, inclusive. 



From the foregoing account it will be seen that 

 these experiments on the mixed herbage of perma- 

 nent grass land, involve a very great deal of work ; 

 they do, in fact, involve more than any other equal 

 area of the Field experiments. In the field there are, 

 it is true, no mechanical operations, as in the case of 

 the arable land. But from the complexity of the 

 produce, and the great difference in composition, both 

 botanical and chemical, of the herbage of the different 

 plots, the sampling of the crops, the preparation and 

 treatment of the samples, and the analytical work, 

 both botanical and chemical, take up much time, and 

 employ much labour. 



The sampling of the soils, the preparation of the 

 samples, and the determinations of nitrogen, carbon,, 

 and nitric acid, in them, have also occupied much time. 



Until the whole of the results for Part III have 

 been arranged, and fully studied, it is impossible to 

 decide whether any. or what reduction, in the sampling 



