74 



March, 1849. Washington. 8vo. — From the American Colo- 

 nization Society. 



Journal of the Franklin Institute. Third Series. Vol. XVII. No. 3. 

 March, 1849. Philadelphia. 8vo. — From the Institute. 



The Medical News and Library. Vol. VIII. No. 75. March, 

 1849. Philadelphia. 8vo. — From Lea 6^ Blanchard. 



An Inquiry into the alleged tendency of the Separation of Convicts, 

 one from the other, to produce Disease and Derangement. By 

 a Citizen of Pennsylvania. Philadelphia, 1849. 8vo. — From 

 the Philadelphia Society for the Alleviation of the Miseries of 

 Public Prisons. 



Annals and Magazine of Natural History, including Zoology, Botany, 

 and Geology. Vol. III. No. 13. January, 1849. London. 

 8\o.— From Sir William Jardine, Bart. 



Dr. Patterson, in the name of Prof. A. D. Bache, laid before 

 the Society, an abstract of a report, made by Mr. Sears C. Wal- 

 ker, of the results of the telegraphic operations of the U. S. 

 Coast Survey, made by him on the 23d January last, between 

 Washington and Philadelphia, New York and Cambridge, 

 Mass. A letter from Prof. Bache to Dr. Patterson, accompa- 

 nying the report, was read by Prof. Kendall. 



Washington, March 1, 1849. 



Dear Sir, — Will you please communicate to the American Philo- 

 sophical Society a brief abstract of a Report made to me on the 21st 

 ultimo, of the results of the Telegraph operations of the U. S. Coast 

 Survey, made on the 23d of January last, between Washington, Phi- 

 ladelphia, New York and Cambridge, Mass., by Mr. Sears C. Walk- 

 er, assistant, having charge of the Telegraph operations. 



The object in view was to test the practical working of the method 

 of imprinting the dates of star transits on a graduated clock register. 

 The three astronomical stations, selected for the occasion, were the 

 Philadelphia Observatory, under the direction of Prof. Kendall; the 

 New York City station, in the private residence of Dr. L. M. Ruther- 

 ford, under Prof. E. Loomis; and the Harvard Observatory, Cam- 

 bridge, under Prof. Wm. Cranch Bond. 



In conformity with the plan of his Report of December 15, 1849, 

 duplicate records were kept at the Washington Northern Telegraph 

 office, by Mr. Walker and myself. 



The astronomical clock was located at Philadelphia, and rated for 



