240 SOILS: PB0PEMTIE8 AND MANAGEMENT 



Station^ in England. (See Fig. 38.) Here blocks of 

 soil one one-thousandth of an acre in surface area were 

 isolated by means of trenches and tunnels, and, supported 

 in the meantime by perforated iron plates, were separated 

 from the surrounding soil bv masonry. The blocks of soil 

 were twenty, forty, and sixty inches in depth, respectively. 

 Facilities for catching the drainage were provided under 

 each lysimeter. The advantage of such a method of 

 construction lies in the fact that the structural condition 

 of the soil is undisturbed and consequently the data are 

 immediately trustworthy. 







Tunrte/ 



G'' 



■• '. '■' ",:-'::*-;V:.v-::: • ■ V. ■■ • • 



>*«: • • - . 



.J ■ * 



\^ 6'*S&iiter7?f& 



o 



Fig. 39. — Cross section of a soil tank at Cornell University, New 

 York, (a), soil under investigation ; (p), outlet of drainage pipe. 



^Lawes, J. B., Gilbert, J. H., and Warington, R. On the 

 Amount and Composition of the Rain and Drainage Waters 

 Collected at Rothamsted. Jour. Roy. Agr. Soc, Ser. II, Vol. 

 17, pp. 269-271. 1881. 



