6 



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



Certain difficulties are experienced in attempting to calculate from these 

 figures the actual quantity of calcium carbonate per acre in the soil at different 

 periods, owing to the impossibility of drawing samples that represent the same 

 layer of soil on each occasion. Since changes of texture are set up by the 

 different treatment of the plots the consolidation of the surface layer varies, 

 so that the 9-inch slice includes more or less soil from time to time. On 

 most plots the weights of the samples tend to get heavier, because the soil 

 sets more closely together under the conditions of long-continued manuring 



Table II.— Weights of Fine Soil Dried at 100° C. per Acre. 



Broadbalk Field. 



Plots. 



Depth. 



1856. 



1865. 



1881. 



1893. 



1904. 



26 



Other plots 



1st 9 inches 

 1st 9 inches 



lbs. 

 2,200,000 



lbs. 

 2,200,000 

 2,300,000 



lbs. 

 2,400,000 

 2,560,000 



lbs. 

 2,400,000 

 2,650,000 



lbs. 

 2,400,000 

 2,650,000 



All plots 



2nd 9 inches 

 3rd 9 inches 



2,590,000 

 2,815,000 



2,590,000 

 2,815,000 



2,590,000 

 2,815,000 



2,590,000 

 2,815,000 



2,590,000 

 2,815,000 



Hoos Field. 



Plots. 



Depth. 



1868. 



1882. 



1904-5. 



7-2 



Other plots 



1st 9 inches 

 1st 9 inches 



lbs. 

 2,400,000 



lbs. 

 2,100,000 

 2,400,000 



lbs. 

 2,100,000 

 2,400,000 



All plots 



All plots 



2nd 9 inches 

 3rd 9 inches 



2,721,000 

 2,891,000 



2.721,000 

 2,891,000 



2,721,000 

 2,891,000 



Agdell Field. 



Plots. 



Depth. 



1867. 



1874. 



1883-4. 



1905. 



All plots 



1st 9 inches 

 2nd 9 inches 



lbs. 

 2,140,000 

 2,450,000 



lbs. 

 2,400,000 

 2,450,000 



lbs. 

 2,500,000 

 2,450,900 



lbs. 

 2,500,000 

 2,450,000 



Little Hoos Field. 



Plots. 



Depth. 



1873. 



1904. 



All plots 



All plots 



1st 9 inches 

 2nd 9 inches 



lbs. 

 2,500,000 

 2,500,000 



lbs. 

 2,500,000 

 2,500,000 



