DIBECTION IN WHILH liKAl.NS SHOULD KUN. 73 



distances apart, according to the abundance of ^\ ater 

 and the nature of the soil. F'rom 20 to 50 feet be- 

 tween them, would probably be the limits for most 

 cases. It is sometimes necessary to make a little cross 

 drain, to carry away the -water from some strong ^ring. 

 In all ordinar)' rases, the drains running straight clown, 

 and dischargring into a main cross drain at the foot, 

 are ri; ' " ' nt. 



Ti re now introduced into this country, 



.vill MXJii •'> extensive use. Their easy 



[ y, their jM > y when laid down, an<l the 



I - rit'ction of their work, will recommend thetn for 



.:■ ntral adoption. It is also to be notice<l that it takes 



li s< time to lay them than stones, and that the ditch 



i-fr! for their reception is smaller and narrower. 



I >rn of it need only be wide enough to receive 



the tiles. The up of the earth is taken out 



with a common sj 1 the lower part witli one 



r. 1 N i; :ite narrow for the purpose, being on 



t ur in( Ik's wide at the point. The bottom is 



clean and smooth, with a peculiar hoe or scoop(fig. 10). 



P^ „ This is necctisar)-, 



because the tiles 



must be laid on 

 wm even 8mo<> h 

 foundation. 



racTiow T. ow sTBdon, ako tkench rtoroRiNu. 



In connection with draining, roust be nntire>.] -. ,, 

 '^ ' 'ieof mechanical improvement; t 

 1 i;. The subsoil plough is ar; 



'-••■''■ 1 ' 'i to stir up and loosen the lower 

 ' it to the nurfnce. It follow* s ;„, 



pbugh, and goes down as .. ■ hr> 



forced, m some cases from 20 to S3 titehes. 1 

 7 



