If PKEPAUrSTG THE GEOTOTD. 



" ripped " in the centre, lengthwise, and then nailed 

 together in the form of the letter A , "^'^^^ when laid 

 on a firm bottom, with enongh fall, outlast a genera- 

 tion. The expense of tiles or boards is about the 

 same — one and three-quarter cents a foot. To avoid 

 making a blimder in so important a matter, it is 

 always best to employ an engineer to nin the lines 

 and mark the levels. Twenty-five dollars so spent 

 will never be regretted. The expense, counting 

 everything, usually amoimts to fifty or sixty dollars 

 an acre. When the sub-soil plough is used to loosen 

 the soil before digging the drains, the cost may be 

 very materially lessened. 



Peepaeikg the Gbotint). — ^A soil having an aver- 

 age depth of four or five inches cannot be brought 

 up to the standard of excellence in less than tliree 



nOLBBOOK'S SWIVEL PLOUGH. 



years. The first step to be taken is to deepen it; 

 this is partly done by surface-])longhing eight or ten 

 inches deep, in the Fall, and follomng, in the bob- 



