James Dwight Dunn. — Beecher. 7 
third daughter oi' Professor Benjamin Silliman. He was edi- 
tor of the American Journal of Science from 1846 to the time 
of his death, and contributed to this repository of American 
science about one hundred and fifty scientific articles, besides 
hundreds of reviews and miscellaneous notices. He was ap- 
pointed professor of natural history in Yale College in 1850, 
and in 1864 the title was changed to that of professor of geol- 
ogy and mineralogy. With brief interruptions, due to ill 
health, he gave instruction in the class room until 1890, when 
.igain from failing health he was compelled to relinquish active 
college work and in 1894 he was made Professor Emeritus. 
After his retirement, he devoted nearly all his remaining en- 
ergy to the completion of the enormous task of wholly revis- 
ing and rewriting the Manual of Geology and of successfully 
carrying it through the press. This volume of more than one 
thousand pages was presented to the public in February, 1895, 
and two months later, on the fourteenth of April, its distin- 
guished author and teacher passed away, at the age of eighty- 
two years. 
BIBLIOGRAPHY. * 
L835. On the condition of Vesuvius in July, 1834. Amer. Jour. Sci., 1 1 1, 
vol. 27. pp. -281-288. 
A new system of crystallographic symbols. Tbid., vol. 2s. pp. 
250-262. 
L836. A new mineralogieal nomenclature. Amer. Lye. Nat. Hist. N. 
V.. vol. 4. pp. 0-34. 
On the formation of compound or twin crystals. Amer. Jour. 
Sci., ill. vol. 30, pp. 275-300. 
Two American species of the genus Hydrachna, Tbid., pp. 354- 
359. 
ls.iT. A system of mineralogy : including an extended treatise of crys- 
tallography ; with an appendix, containing the application 
of mathematics to crystallographic investigation, and a min 
eralogical bibliography. New Haven, large 8vo, xiv 4- 580 pp. 
Description of the Argulus catostomi. Amer. Jour. Set., (1), 
vol. 31, pp. 297-308. 
On the identity of the ton-elite of Thomson with columbite. 
Tbid., vol. 32, pp. 149-153. 
On the drawing of figures of crystals. Tbid., vol.33, pp. 32-50. 
Crystallographic examination of eremite. Tbid., pp. 70-75. 
1838. Description of a crustaceous animal belonging to the genus 
Caligus. Tbid., vol. 34. pp. 225-266. 
♦Reprinted with slight changes and additions from " Bibliographies of the Present 
Officers of Yale University," Nev> Eaven, 1893. 
