The writer, having resided in the village of Niagara Falls for more than a third of a century, has had opportunity to become thoroughly acquainted with the locality, and to study it with constantly increasing interest and admiration. Long observation enables him to offer some new suggestions in regard to the geological age of the Falls, their retrocession, and the causes which have been potent in producing it; and also to demonstrate the existence of a barrier or dam that was once the shore of an immense fresh-water sea, which reached from Niagara to Lake Michigan, and emptied its waters into the Gulf of Mexico
