PERCOLATIOX, .VXD EVAPORATION. 



67 



Table XII. — Percolatioij THROUGn 3 feet of Chalk with grass 



GROWING ON THE SURFACE ; AND EVAPORATION FROM THE SURFACE, 

 BEING THE DIFFERENCE BETWEEN THE PERCOLATION AND THE 



Eainfall ; AT Nash Mills, Hejiel Hempstead, 1st April, 

 1854, TO 31sT March, 1884. 



