DR. DAUBENY ON THE ROTATION OF CROPS, ETC. 



219 



It next appeared to me desirable, both by way of testing the accuracy of these re- 

 sults, and likewise of ascertaining whether the third sample of barley analysed might 

 really be adopted as a fair representative of a standard crop, to examine separately 

 the grain and straw taken from a crop of average quality grown in the neighbourhood 

 of Oxford. 



Mr. Druce of Ensham accordingly supplied me with a sample of barley from his 

 farm, of which the following analysis was made by Mr. Way. 



1000 parts of the crop of barley from a field near Ensham, situated on the Oxford 

 clay, consisted of — 



Grain 575 



Aulm 37 



Straw 383 



1000 



Of the Grain. — 100 parts yielded of ash 2*04 parts, 100 grains of which consisted of— 



Charcoal*, extraneous . 24*51 

 Peroxide of iron, extraneous 2*30 



26-81 

 Ingredients of the grain . 73-86, viz.- 



Total . . . 100-69 



73-86 



100-4 



Of the Straw. — 100 parts yielded 4*2 of ash, of which 100 parts contained — 



Sand and charcoal, extraneous 4-20 

 Peroxide of iron, extraneous . 474 



Ingredients of the straw. 

 Total ... 



8-94 

 94-62, viz. — 



103-56 



Silica .... 44-72 



Phosphoric acid . 1-68 



Sulphuric acid . 4-38 



Carbonic acid . 121 

 Chloride of sodium 7'85 



Soda .... 0-98 



Potass .... 22-98 



Magnesia ... 1*67 



Lime 915 



Excluding extraneous 

 matter. 

 or 47*20 



1-80 



4-60 



1-27 



8-25 



r06 



or 



or 



or 



or 



or 



or 24-40 



or 170 



or 9-65 



103-56 



99-93 



* In this instance the extraneous matter not dissolved by muriatic acid proved to consist almost wholly of 

 MDCCCXLV. 2 G 



