1884.] 443 {Ruschenberger, 
Several retired to accept professorships in medical colleges, and 
their places were supplied by new appointments, so that during 
the career of the Association the names of many distinguished 
physicians are recorded on its list of members.* 
Dr. Bridges was elected professor of chemistry in the Frank- 
lin Medical College in 1846, and filled the office till the insti- 
tution was dissolved in 1848. 
His contributions to medical and scientific literature are 
valuable, but not very numerous. 
His papers in the American Journal of Pharmacy are 
entitled, “Chemical symbols,” and “ Pyroacetic spirit and its 
derivative compounds,” in 1839; “The manufacture of sul- 
phuric acid,” and the “ Adulteration of lac sulphuris,” in 
1840; “Notice of Professor Kane’s researches on ammoniacal 
compounds,” “ Poisoning by long continued use of acetate of 
lead,” in 1841; “Observations on two species of aristolochia 
which afford serpentaria,” “Observations on the action of ether 
on galls,” “ Report on Procter’s hydrated peroxide of iron,” in 
1848; “Hxperiments on the absorbing power of anthracite,” 
“Precipitated carbonate of lime,” “Solution of iodide of iron,” 
“ Solidification of carbonic acid,” in 1844; “Pil hydrargyri,” 
in 1846, and “Southern prickly-ash bark,” in 1865. 
In July, 1845, Dr. Bridges “edited with additions” the 
American reprint of Elementary Chemistry, Theoretical and 
Practical, by George Fownes, and subsequently several editions 
of this popular volume. The latest American, from the twelfth 
English edition of the work, was issued May, 1878. 
He also edited, 1852, the American reprint of Graham's 
Hlements of Chemistry. 
From 1854 till 1877, inclusive, he contributed very many 
bibliographical notices and reviews, chiefly of works on chem- 
istry, to the American Journal of the Medical Sciences. 
*David H. Tucker, William V. Keating, J. H. B. McClellan, Ellerslie Wallace, 
Addinell Hewson, John H. Brinton, 8. Weir Mitchell, Alfred Stillé, Morton 
Stillé, J. M. DaCosta, Francis West, James Darrach, and Edward Hartshorne, 
were teachers in this Association, Including the constituent members, a corps 
of better qualified instructors than those associated in this summer school could 
not be easily found anywhere. 
