_Caconac, Caconacquerie_ (Vol. ii., p. 267.).--This is a misprint of yours,
or a misspelling of your correspondents. The word is _cacouac,
cacouacquerie_. It was a cant word used by Voltaire and his correspondents
to signify an _unbeliever_ in Christianity, and was, I think, borrowed from
the name of some Indian tribe supposed to be in a natural state of freedom
and exemption from prejudice.