[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:—­

We may be quite sure that this Hall will be a center of deep interest to coming generations.  Long after we shall have passed away will the men of New-York, as they survey these monuments, feel stimulated to engage in other noble enterprises by this work of their progenitors, and from many a distant part of the civilized world will men come here to solve their scientific questions, and to bring far-off regions into comparison with this.  New-York, then, by her liberal patronage, has not only acquired an honorable name among those living in all civilized lands, but has secured the voice of History to transmit her fame to far-off generations.

Sir William Logan asks “The way to Albany.”

Sir William E. Logan, of Canada, in a brief speech acknowledged the services rendered by the New-York Survey to Canada.  He should manifest ingratitude if he declined to unite in the joyful occasion of inaugurating the Museum which was to hold forever the evidence of the truth of its published results.  The Survey of Canada had been ordered, and the Commission of five years twice renewed; and the last time, the provision for it was more than doubled.  It happened to him, as Mr. Agassiz had said:  after crossing the ocean first, the first thing he asked was, “Which