APPENDIX. 



97 



sod, or turf, the grass downwards, and the earth firmly 

 trod down over them. 



Tile-drains may be constructed of a variety of forms. 

 When laid down the slopes of the lands, and about 

 twenty to thirty feet distant, tile-tubes of a single inch 

 diameter will carry off all the surplus water, unless it ig 

 unusually abundant. We annex several forms of tiles, 

 adapted for different kinds of lands, and the mode of 

 their insertion in the ground. 



i * a 



Nos. 1 and 2 are available 

 where the quantity of water is 

 not greatly in excess ; and Nos. 

 3, 4 and 5 are also applicable 

 where the surplus water is not 

 too great. 



