16 PERMANENT AND TEMPORARY PASTURES 



some heath lands, four or five inches below the surface. These 

 hard subsoils are as impervious to water as beds of cement. 

 Before putting drain-tiles into such land, an experiment 

 should be made to ascertain whether satisfactory drainage 

 cannot be obtained by breaking up the subsoil to a sufficient 

 depth. If the trial prove successful, the expense of putting 

 in tiles may be saved, and the fertility of the land will be 

 increased. But in many cases it will be necessary both to 

 break up the subsoil and to put in pipes before effectual 

 drainage can be secured. 



