Sentence:  Neither should that odious custom be allowed, of cutting scraws, (as they call them) which is flaying off the green surface of the ground, to cover their cabins; or make up their ditches; sometimes in shallow soils, where all is gravel within a few inches; and sometimes in low ground, with a thin greensward, and <WSD>sloughy</WSD> underneath; which last turns all into bog, by this mismanagement. 
Meaning of the word marked with <WSD> tags:  Marshy; having the characteristics of a wetland.