[Footnote A: In the letter alluded to, on examination, we
discover another passage bearing on the point, which, owing to
the Professor's modesty we suspect, he did not read. Prof. Mather
adds. "You, so far as I know, first suggested the matter of such
an Association. I laid the matter before the Board of Geologists
of New-York, specifying some of the advantages that might be
expected to result; and Prof. Vanuxem probably made the motion
before the Board in regard to it."]

Though the Board adopted the plan of a meeting, various causes
delayed the first over till April, 1840, when we assembled in
Philadelphia, and spent a week in most profitable and pleasant
discussion, and the presentation of papers. Our number that year
was only 18, because confined almost exclusively to the State
geologists; but the next year, when we met again in Philadelphia,
and a more extended invitation was given, about eighty were
present; and the members have been increasing to the present
time. But, in fact, those first two meetings proved the type, in
all things essential, of all that have followed. The principal
changes have been those of expansion and the consequent
introduction of many other branches of science with their eminent
cultivators. In 1842, we changed the name to that of the
Association of American Geologists and Naturalists; and in 1847,
to that of the American Association for the Advancement of
Science. I trust it has not yet reached its fullest development,
as our country and its scientific men multiply, and new fields of
discovery open.

Prof. H. said of this particular occasion:--