722 
Pharmacy, Franklin Institute, Zoological Society, and Prof. 
E. D. Cope, of Philadelphia; U.S. Department of the In- 
terior ; University of Virginia; Botanical Gazette; Daven- 
port Academy of Natural Science, and the Commissioners 
of the Argentine Republic at the Centennial Exhibition of 
1876. 
The death of Prof. Joseph Henry, Secretary of the Smith- 
sonian Institution, at Washington, May 13th, 1878, aged 81 
years, was announced with appropriate remarks by Mr. 
Fraley. 
Mr. Roberts added his reminiscences of Mr. Henry at the 
meeting of the British Association at Liverpool, in 1837, 
and described a characteristic scene between him and Dr. 
Dio. Lardner, and the cordial reception of Mr. Henry, by 
the distinguished members of the Association then present ; 
the commencement of many warm and lasting and honor- 
able friendships. 
On motion Mr. Fairman Rogers was appointed to prepare 
an obituary notice of the deceased. 
The death of Mr. Robert Frazer, at Philadelphia, May 
4th, 1878, aged years, was announced by the Secretary. 
On motion Mr. Persifor Frazer, Jr., was appointed to read 
an obituary notice of the deceased. 
A letter to the Secretary respecting an extract from a pa- 
per on Gas Analysis, by Prof. Sadtler, published in the Pro- 
ceedings under date of April 6th, 1878, was received from 
Prot. Henry Morton, dated Hoboken, N. J. 
May 15, 1878. 
To the Secretary American Philosophical Society. 
Dear Sir :—In a printed copy of a paper ‘‘ On the calculation of Results 
in Gas-Analyses,’’ read betore the American Philosophical Society, April 
5, 1878, by Professor Samuel P. Sadtler, which I have just received, I find 
the following statement : 
“Ina private letter to Professor Morton, dated December 31st last, in 
answer to one received from him a day or two before, calling my attention 
to the error, I acknowledged the error of the formula used by me in my 
printed paper, and mentioned that I was proposing to rectify the result as 
first published by the aid of other tests.’’ 
