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2 U.S. Geological Survey, Washington, D.C. (5510-5517.) Wm. W. Wallingsford, Washington, D.C. (5509.) Of these donations, those received from J.M. Falconer and J.W. Osborne do not appear on the books of the registrar, as they were registered as additions to gifts previously reported. [[underlined]] Purchases and Exchanges. [[/underlined]] Only one purchase was made during the period covered by this report, a photo-mechanical color-print (No. 5507), bought for $10.-. There was also only one accession by an exchange, effected through the library, - a book (No. 5508), containing chromolithographs, etc. [[underlined]] Number of Specimens [[/underlined]] The entries on the catalogue number 5561, but as many of these represent series, it is probably safe to say, that the number of specimens belonging to the Section of Graphic Arts is about 6000. Of these 3072 have been placed on