a6 
1884.] 433 [Ruschenberger, 
When the Academy’s building was extended in 1846, and 
the extended building was raised and improved in 1855, he 
served on the building committees, and aided in obtaining sub- 
scriptions for the work on both occasions. 
Again, December, 1865, Dr. Bridges was appointed a mem- 
ber of a committee to solicit subscriptions to erect a fire-proof 
building for the use of the Academy; and, January 8, 1867, he 
was elected one of the Board of Trustees of the Building 
Fund, and by it a member of the Building Committee, Janu- 
ary 11, 1867, on which he served faithfully until the Society 
was established in its new quarters, January, 1876. 
The official positions to which he was annually elected, his 
appointment to several standing and many special committees, 
imply that he had the respect and unreserved confidence of his 
fellow-members. Among them none was more constant, none 
who worked more industriously. He promptly discharged all 
duties imposed upon him and, during forty years, was seldom 
absent from the meetings of the society. In addition to his 
valuable services, he contributed to its funds, to its library and 
its museum as liberally as his modest income justly allowed. 
As a token of their estimate of his worth, a number of mem- 
bers presented to the Academy a portrait of him which, painted 
by B. Uhle, an eminently skillful young artist of this city, will 
soon be hung in place among the portraits of the presidents of 
the society. 
His remarks “On infusoria found in stagnant water’ 
ported in the Proceedings of the Academy for May, 1842; on 
“The influence of the contact of copper in preserving human 
bones,” and on “Indian reliques,” May, 1848; on “ istimates 
of the length of the year,” and on the “ Formation of lithoid 
carbonate of iron,” in the volume for 1848. 
At the Franklin Institute Dr. Franklin Bache taught chem- 
istry, as lecturer and professor,* from September, 1826, till 
1881. During the whole period, five years, Dr. Bridges was 
his assistant. After that time he did not participate in the 
’ are re- 
*Dr. Bache was appointed lecturer on chemistry, September, 1826, and profes- 
sor, March, 1828, 
PROG. AMER. PHILOS. soc, xxr. 115, 80. PRINTED APRIL 28, 1884. 
