As usual with historical word use on short words, you can and should check Google Ngram for the uses, and it seems to almost always be two things:
A proper name (in this case a type of monkey)
And
Bad OCR for the word "both" or "brufh" (which seems to be related to "buffing" or some kind of cleaning, from context?)
You get the same for frequent use of "fuck" which is almost always "suck" written with a long s.