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marine insurance company of Salem, Mass. He declined professorships in Harvard in 1808, in the university of Virginia in 1818, and in West Point academy in 1820. While at Salem he made a beautiful chart of the harbor of that place and those of Beverly, Marblehead, and Manchester, and contributed twenty-three papers, mostly on astronomy, to the "Transactions" of the American academy. He also wrote during this time many articles in the American edition of "Rees's Cyclopsedia." In 1814 he undertook his greatest work, a translation of Laplace's "Mecanique celeste," accompanied by a commentary elucidating obscure passages, giving interesting historical information, and bringing the whole subject down to the latest date. This commentary forms more than half the work, as produced by Dr. Bowditch. It is said that there were at this time only two or three persons in the country capable of reading the original work critically. The greater part of this gigantic undertaking was finished in 1817; but publication would cost at least $12,000, a sum beyond the mathematician's means. In 1823, however, he was given the place of actuary to the Massachusetts hospital life insurance company of Boston, with a liberal salary, which enabled him to give his work to the world. Bowditch refused to publish the book by subscription, saying that he would rather spend $1,000 a year for such an object than in keeping a carriage. His wife and family promised to make any sacrifice necessary to its accomplishment, and he dedicated his translation to the former, stating that "without her approbation the work would not have been undertaken." The first volume appeared in 1829, the second in 1832, the third in 1834, and the fourth just after his death. The fifth, which Laplace had added to his work many years after the others, was subsequently issued under the care of Prof. Benjamin Peirce. During the latter years of his life Dr. Bowditch was a trustee of the Boston athenæum, president of the American academy of arts and sciences, and a member of the corporation of Harvard college, which had given him the degree of LL. D. in 1816. He was at his death a member of the royal societies of London and Edinburgh, the royal academies of Palermo and Berlin, the royal Irish society, the royal astronomical society of London, and the British association. He also twice held a seat in the state executive council of Massachusetts. Like many other mathematicians. Dr. Bowditch was fond of poetry. Bryant was his favorite American poet, and he considered the "Old Man's Funeral" one of the most beautiful pieces in the English language. His tomb and statue are ha Mount Auburn cemetery, Cambridge, and his scientific library is still preserved in Boston. Prof. Pickering delivered a eulogy of him, including an analysis of his scientific publications, before the American academy, on 29 May, 1838 (Boston, 1838); and another was delivered in Salem, by Judge Daniel A. White, at the request of the corporation of that city (Salem, 1838). See also "Memoir of Nathaniel Bowditch," by his son, Nathaniel I. Bowditch (Boston, 1839); and "Discourse on the Life and Character of Nathaniel Bowditch," by Alexander Young (Boston, 1838). A full list of his mathematical papers may be found in the " Mathematical Monthly " (vol. ii., Cambridge, Mass.).—His son, Nathaniel Ingersoll, author, b. in Salem, Mass., 17 Jan., 1805; d. in Brookline, Mass., 16 April, 1861, w^as graduated at Harvard in 1822, studied law, and was admitted to the bar in 1825, but soon left his practice "and devoted himself to business as a conveyancer. He became noted for accuracy and industry, and it is said that scarcely a transfer of real estate was made in Boston without his examination and approval of the title. He wrote altogether fifty-five folio volumes of land-titles, containing 30,000 pages, besides plans and maps. He gave much attention to public institutions in Boston, particularly to the Massachusetts general hospital, of which he published, at his own expense, a comprehensive history (1857). He had previously issued a memoir of his father (1839), which was also prefixed to the latter's translation of Laplace's "Mecanique celeste." He also published "Suffolk Surnames " (1857; enlarged editions, 1858 and 1861). This work contains curious surnames met with by Mr. Bowditch in his business. Its peculiarity is in the author's system of classification by the derivation of the names. Mr. Bowditch bestowed much of his large income upon charitable objects, including a gift of $70,000 to Harvard for founding scholarships, and a bequest of $2,000 to that college for the purchase of books.—Another son, Henry Ingersoll, physician, b. in Salem, Mass., 9 Aug., 1808 ; d. in Boston, Mass., 14 Jan., 1892, was graduated at Harvard, took his medical degree there, and studied in Paris. He was professor of clinical medicine at Harvard from 1859 till 1867, chairman of the state board of health (1869-'79), and member of the national board in the latter year, surgeon of enrollment during the civil war, president of the American medical association in 1877, and physician at the Massachusetts general hospital and the Boston city hospital, where he served from 1868 to 1872. To Dr. Bowditch is due the discovery of the law of soil moisture as a potent cause of consumption in New England. He also proved to the medical profession of this country and Europe that thoracentesis, in pleural effusions, if performed with Wyman's fine trocars and suction-pump, is not only innocuous, but at times saves life or gives great relief. Dr. Bowditch was made an abolitionist by the mobbing of Garrison in 1835, and worked earnestly in the anti-slavery cause. "He was the first in Boston," says Frederick Douglass, "to treat me as a man." He was the author of "Life of Nathaniel Bowditch, for the Young" (1841); "The Young Stethoscopist" (Boston, 1846; 2d ed.. New York, 1848); "Life of Lieutenant Nathaniel Bowditch" (50 copies, printed privately, 1865); "Public Hygiene in America," a centennial address at Philadelphia in 1876, and many articles in medical journals and papers read before the State board of health (1870-8). He translated "Louis on Typhoid" (2 vols.. Boston, 1836); "Louis on Phthisis" (1836) ; and "Maunoir on Cataract " (1837).—Nathaniel Bowditch's grandson, Henry Pickering, physician, b. in Boston, Mass., 4 April, 1840, was graduated at Harvard in 1861, began the study of chemistry at Lawrence Scientific School, and in" 1868 received the degree of M. D. from Harvard Medical School. Soon after the beginning of the civil war he was commissioned second lieutenant in the 1st Massachusetts cavalry, and rose gradually until he attained the rank of major in the 5th Massachusetts cavalry, which office he resigned 3 June, 1865. He then continued his studies under Jeffries Wyman at Lawrence Scientific School, but his attention was attracted to medicine, which he has since followed. From 1868 to 1871 he studied physiology in France and Germany, principally at Leipsic, imder Prof. Ludwig. In 1871 he became assistant professor of physiology at Harvard Medical College, and in 1876 was elected to the full chair. Dr. Bowditch is a member of the American Academy of Arts and