circumscription of the area which, in the course of time, was
to become the continent we now inhabit, with its modern features.[A]

[Footnote A: It would be impossible to encumber the pages of the
_Atlantic Monthly_ with references to all the authorities on which such
geological results rest. They are drawn from the various State Surveys,
including that of the mineral lands of Lake Superior, and other more
general works on American geology.]

Not only from the geology of America, but from that of Europe also, it
would seem that the position of the continents was sketched out very
early in the progressive development of the physical constitution of our
earth. It is true that in the present state of our knowledge such wide
generalizations must be taken with caution, and held in abeyance to the
additional facts which future investigations may develop. But thus far
the results certainly do not sustain the theories which have lately
found favor among geologists, of entire changes in the relative
distribution of land and sea and in the connection of continents with
one another; on the contrary, it would appear, that, in accordance with
the laws of all organic progress, arising from a fixed starting-point
and proceeding through regular changes toward a well-defined end, the
continents have grown steadily and consistently from the beginning,
through successive accessions in a definite direction, to their present
form and Organic correlations. If, indeed, there is any meaning in the
remarkably symmetrical combinations of the double twin continents in
the Eastern Hemisphere, so closely soldered in their northern half, as
contrasted with the single pair in the Western Hemisphere, isolated in
their position, but so strikingly similar in their Outlines, they must
be the result of a progressive and predetermined growth already hinted
at in the relative position and gradual increase of the first lands
raised above the level of the ocean.

However this may be, there can be no doubt that we now know with
tolerable accuracy the limits of the land raised above the water at that
period in the present United States. Let us see, then, what we inclose
between oar two lines. We have Newfoundland and Nova Scotia, the greater
part of New England, the whole of New York, a narrow strip along the
north of Ohio, a great part of Indiana and Illinois, and nearly the
whole of Michigan and Wisconsin.

Within this region lie all the Great Lakes. The o