236 



Iodine for Hydrogen in Organic Compounds, and on the 

 properties of lodo-Pyromeconic Acid. By Mr James 

 Brown, assistant to Dr Thomas Andei^son. 



Following up his researches on pyromeconic acid, read before 

 this Society in 1852, the author described a method which he had re- 

 cently discovered, through his experiments on iodo-pyromeconic acid, • 

 of generally obtaining iodine substitution for hydrogen compounds. 



The mere digesting pyromeconic acid with tincture of iodine was 

 not successful ; because, as the author considered, there was no body 

 present, capable of drawing all the hydrogen in the compound to it- 

 self, and so leaving, as it were, an open space which the iodine might 

 step into and occupy. 



This requisition, however, he found to be perfectly complied with, 

 by introducing with the iodine a certain quantity of either bromine 

 or chlorine ; and the mode which he preferred of producing the iodo- 

 pyromeconic acid was, by mixing a freshly-prepared solution of 

 chloride of iodine with a cold saturated solution of pyromeconic acid. 



The I'esulting acid is monobasic, and forms salts, of which those 

 of baryta of lead v/ere described by the author at length. 



The following Gentleman was elected an Ordinary Fel- 

 low: — 



Henry Dunlop, Esq. of Craigton. 



The following Donations to the Library were announced : — 

 Smithsonian Contributions to Knowledge. Vol. V. 4to. 

 Sixth Annual Report of the Board of Regents of the Smithsonian 



Institution for the year 1851. 8vo. 

 Smithsonian Institution Meteorological Tables. Prepared by Arnold 



Guyot. 8vo. 

 Portraits of North American Indians. With Sketches of Scenery, 



&c. Painted by J. M. Stanley. Deposited with the Smith- 

 sonian Institution. 8vo. 

 Catalogue of North American Reptiles in the Museum of the 



Smithsonian Institution. 8vo. — From the Institution. 

 Owen's Geological Survey of Wisconsin, Iowa, and Minnesota. 



With Illustrations. 4to. 

 Schoolcraft's History of the Indian Tribes of the United States. 



Part 3. 4to. 

 Memoirs and Maps of California. By Ringgold. 8vo. 



