Sentence:  From the minute description of the machinery, I am apt to think it is made at a considerable expense; ... I am therefore induced to mention the manner of <WSD>hummelling</WSD> (or fattering, as it is called in this county) with me. ... My thrashing mill is of the old construction, being the first erected in this county (excepting one on Cotterel's plan), and is very powerful; but I apprehend any machine has power enough for the <WSD>hummelling</WSD> work. 
Meaning of the word marked with <WSD> tags:  To separate (barley, oats, etc.) from the awns.