This work tells the eastern origin of the Celtic Nations proven by
a comparison of their dialects with the Sanskrit, Greek, Latin and
Teutonic languages, forming a supplement to researching into the
physical history of mankind. The author presents this treatise as a
supplement to his "Researches into the Physical History of
Mankind." It was undertaken with the view of furnishing proofs
of a series of facts containing the results of inquiries which were
sufficient for the author's own conviction.