Early attestation of "canuck"

[David D. Robertson]

http://listserv.linguistlist.org/cgi-bin/wa?A2=ind0308c&L=ads-
l&D=1&F=&S=&P=2238

This 1843 cite may give pause to those who suspect Chinook Jargon "kanaka"
as the source for North American English "canuck".  Or not?