past in its possession,—an event which I think unlikely to happen, and which will now be unnecessary, the more especially as I am at present engaged in a new reduction of my materials, and the projection of a new map, the publication of which, in sufficiently large form to give it topographical as well as geographical value, has been proposed by my distinguished and very kind friend, Dr. Augustus Petermann, Gotha, in his Geographical Journal.
Papers descriptive of the botanical collection, prepared by Mr. Elias Durand; of the algæ, by Mr. Ashmead; of the lichens, by Professor James; of the birds, by Mr. John Cassin; of the invertebrata, by Dr. William Stimpson; of the mammalia, by Dr. J. H. Slack; of the cetacea, by Professor E. Cope; of the infusoria, by Dr. F. W. Lewis; of the fishes, by Dr. Theodore Gill; and of the paleontology, by Professor F. B. Meek, have appeared from time to time in the "Proceedings of the Academy of Natural Sciences of Philadelphia," excepting the last, which was published in the American "Journal of Arts and Sciences." Dr. J. Atkin Meigs has in preparation a monograph on ethnology, based upon a collection of upward of one hundred and forty specimens, and I shall soon have completed a more elaborate discussion of the Greenland Glaciers and other collateral topics than has been allowed me by the limits and character of this work.
I should do great injustice to my own feelings, did I not here express the acknowledgment of my obligation to those societies, associations, and indi-
