The thick guts are three, the blind gut, colon, and right gut.

A good material for smaller belts, and for strings and bands for connecting larger ones, is that recently patented by Vornberger, in which the gut of cattle is the basis.

[This might appear to be a corruption of go out, or of God's gut (God's guts is an ejaculation found elsewhere); but from a subsequent passage we can but conclude that the disease so called is intended.]