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364 vessels of the squadron, under the command of Commodore Wilkes, sailed in 1838, on a voyage around the world. After extensive explorations, and suffering shipwreck, moreover, at the mouth of the Columbia River, in Oregon, Mr. Dana returned home in 1842. The rare opportunities which this voyage afforded for scientific observation had been well improved. During the thirteen years after its termination, he was engaged in preparing for publication the various reports of this expedition committed to his charge.

Mr. Dana resided at Washington from 1842 to 1844, and then returned to New Haven, Connecticut, where he, soon after, married Henrietta Frances, third daughter of Prof. Benjamin Silliman, and where he has since resided. Before going to the Pacific, he published, in 1837, the first edition of his "Mineralogy," of which the fifth and last edition appeared in 1868. This is a work of high repute, both in America and Europe.

His first publication connected with his observations in the Exploring Expedition was a "Report on Zoophytes," which appeared in 1846, a quarto volume of 740 pages, with an atlas of 61 folio plates. In this work Mr. Dana reviewed the whole department of Polypes, combining his own observations with those of earlier authors, and proposed a new classification, bringing, for the first time, the Actiniae and the Alcyonoid Polypes into their true relations to the Astræeoid [sic] Polypes. The number of new species which he describes is 230.

The second work in the same series was a "Report on the Geology of the Pacific," published in 1849, a quarto volume of 756 pages, with an atlas of 21 plates. This work presents a view not only of the geology of parts of Australia, Western America, and the islands of the Pacific, but also treats at length, and with original views, of Volcanic Phenomena, Coral Reefs and Islands, and the General Features of the Globe.

The third work pertaining to this Government Exploring Expedition was a "Report on Crustacea," which appeared in 1852-'54—the text, 1,620 pages quarto; the atlas, 96 plates in folio: 680 species are described in this work, of which 658 are new. The subjects of Classification and Geographical Distribution receive in it special attention. These reports were published by the Government of the United States, and only 200 copies of each have thus far been issued. With few exceptions, the drawings in these atlases were made by Mr. Dana himself.

While engaged in preparing the last two of these reports, Mr. Dana has been the active editor of the American Journal of Science and Arts, founded in 1819, by Prof. Silliman, Sr., and well known as the great repository of the scientific labors of their countrymen. To this journal, which has now in 1872 reached its 103d volume, as well as to the Proceedings of the American Academy of Arts and Sciences, in Boston, the Lyceum of Natural History, of New York, and the