' ARTIFICIAL MANURE. 207 



The proportion of these several higredients must be known 

 before the value of peat can be compared with similar con- 

 stituents in cow-dung. This proportion is exhibited in the 

 following table of constitution of Massachusetts peat per 

 100 parts : 



257. Under the general name of peat, are comprised sev- 

 eral varieties, which may be distinguished as, 1st. Peat, the 

 compact substance generally known and used for fuel, under 

 this name. 2d. Turf, or swamp-muck, by which is to be 

 understood the paring which is removed before peat is dug. 

 It is a less compact variety of peat. It is common in all 

 meadows and swamps, and includes the hassocks. Both these 

 varieties are included in the above, from No. 1 to No. 10. 

 It includes, also, the mud of salt marshes. 3d. Pond mud, 

 the slushy material found at the bottom of ponds when dry, 

 or in low grounds, the wash of higher lands. This seldom 



