24 Mr. A. D. Hall and Dr. N. H. J. Miller. [Mar. 30, 



Table XII. — Basic and Acid Constituents of various Crops. 





Agdell 



Agdell 



Agdell 







rotation. 



rotation. 



rotation. 







Wheat. 



Barley. 



Swedes. 



Park hay, 

 Plot 9, 





Complete 



Complete 



Complete 



1856-1873. 





manure. 



manure. 



manure. 





8 courses. 



8 courses. 



3 courses. 





Dry matter per acre 



4749 



4124 



3899 



4812 



Nitrogen per cent, in dry matter... 



0-88 



1-00 



2-41 



1-55 





4-74 



4-00 



6-59 



7-24 



Percentage Composition of Ash. 





0-37 



0-64 



0-96 



1-32 





4-41 



7-82 



13 -42 



8-27 





2-98 



4-16 



2-70 



3 42 





16 -21 



19 -33 



36 -33 



35 -59 





0-39 



1-67 



4-27 



3-87 





9-09 



12 -88 



9-38 



7 96 



Sulphuric acid 



2-56 



3 58 



12 -36 



5-76 





1-46 



3 15 



4-18 



14-83 





60 -58 



46 -47 



1 -04 



16 -54 



Constituents reduced to Equivalents of Hydrogen, and Lbs. per Acre. 





03 



0-04 



0-09 



0-17 





0-36 



0-46 



1 -24 



1-03 





0-33 



0-34 



0-35 



0-60 





0-78 



0-68 



1-99 



2-64 





0-03 



0-09 



0-36 



0-44 





1-53 



1-61 



4-03 



4 -88 





0-87 



0-90 



1 -02 



1-18 





0-14 



0-15 



0-80 



0-50 





009 



0-15 



0-30 



1 -47 





3-00 



2-97 



6-74 



5 -35 





4-53 



2-55 



0-09 



1-91 



Acids, total, excluding silica ... 



4-10 



4-17 



8-86 



8-50 





1 -53 



1-61 



4-03 



4-88 



Excess of acid (as hydrogen) . . . 



2-57 



2-56 



4-83 



3-62 



Equivalent to calcium carbonate 



129 



128 



242 



181 



the nitrates which entered the plant, as measured by the nitrogen finally 

 contained in it. 



Although the many ash-analyses which have been made of farm crops 

 afford conclusive evidence of this restoration of base to the soil, it seemed 

 desirable to submit the fact to experimental verification. In 1903 water 

 cultures were made of barley and cabbage in normal solutions which were 



