70 CRANBERRY CULTURE. 



tensive of late, that it has frequently been found neces- 

 sary to .construct massive dams of earth, similar to those 

 used for mill-ponds ; and where the surface to be covered 

 is very large, it is better to incur this expense than to 

 leave the vines uncovered in winter. 



Where a small head of water, say about one foot only 

 is required, the dam may be made by throwing up against 

 the turf fence an embankment of sand, and sodding the 



. 29. EMBANKMENT SUPPORTED BY A TURF FENCE. 



face of it with turf, to prevent its being washed down. 

 (See fig. 29.) 



A dam of this character may be seen at our twenty- 

 acre meadow, near New Lisbon, rendering efficient ser- 

 vice where a head of two feet is required. 



The same rule applies to this as to other barriers for 

 holding water, viz. : ISTo muck should be used in its con- 

 struction, and, if possible, allow it to settle thoroughly 

 before raising a permanent head. 



