14 



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



blocks of undisturbed soil of 1/1000 acre in area, isolated by impervious walls 

 from the surrounding land and maintained without vegetation since 1870. 

 Table IX shows the proportion of lime in the water during 20 months 



Table IX. — Lime in Drainage Water percolating through 60 inches of Soil, 

 September, 1896, to April, 1898. 







Drainage through 



CaO in drainage 





Eainfall. 



soil, 60 inches 



water 







deep. 



per minion. 





inches. 



inches. 





1896. 











8-077 



6-362 



60-1 





4-132 



2-992 



56 -3 



November 



1 -387 



-833 



46 -1 



December 



4-416 



3-811 



49-8 



1897. 











2 -031 



1 -585 



48 -9 





2-925 



3-264 



47-9 



March 



4 -197 



2 -589 



48 -2 





1-913 



-320 



48-4 



May 



1-718 



0-047 



53 -3 



June 



2-734 



0-865 



54 -1 



July 



0-467 



0-024 



44-5 



August 



3 -238 



0-105 



61 -0 



September 



2 -440 



0-872 



60-5 



October 



0-960 



o-ooi 







1-048 



0-110 



50 -4 



December 



3-503 



3-060 



56 -6 



1898. 









January 



0-795 



0-821 



53 -1 



February 



1-098 



0-047 



30 -5 





1 -060 



0-492 



51 -5 





1 -443 



0-082 



43 -2 



Average 



2-479 



1-414 



53 -5 



(September, 1896, to April, 1898) ; the average concentration is parts of 

 CaO per million for the gauge with 60 inches of soil, which on the average 

 percolation of 13 - 8 inches would give an annual loss of calcium carbonate of 

 300 lbs. Two causes contribute to make this figure low. In the first place the 

 soil of the gauges is not very rich in calcium carbonate, determinations made on 

 samples taken in 1870 from the land immediately adjoining gave 306 per 

 cent., while two small samples bored out from the actual gauges in 1905 gave 

 1'88 per cent, for the upper 9 inches. Secondly, the air contained in the 

 soil of this plot must be comparatively deficient in the carbon dioxide 



