1873.] Dr. Maxwell Simpson on the Brom-Iodides. 51 



Transactions (continued). 



Shanghai : North China Branch of the Royal Asiatic Society. Journal 

 for 1871 and 1872. New Series. No. 7. 8vo. 1873. Catalogue 

 of the Library. 8vo. 1872. The Society. 



Observations, Reports, &c. 



Calcutta : Report of the Meteorological Reporter to the Government 



of Bengal, by H. F. Blanford. fol. Calcutta 1873. 



The Government of India. 

 Cape of Good Hope : Royal Observatory. Results of Astronomical 



Observations made in the year 1857. 8vo. Gape Town 1872. 



The Observatory. 

 Christiania : Meteorologiske Institut. Norsk Meteorologisk Aarbog 



for 1872. 6 te Aargang. 4to. Christiania. The Institute. 



Greenwich : Royal Observatory. Astronomical and Magnetical and 



Meteorological Observations made in 1871. 4to. London 1873. 



Astronomical Results, 1871. Magnetical and Meteorological 



Observations, 1871. History and Description of the Water 



Telescope. 4to. The Admiralty. 



Washington : Patent Office. Reports, 1869, 1870, 1871. 7 vols. 8vo. 



1871-72. The Office. 



January 8, 1874. 

 JOSEPH DALTON HOOKER, C.B., President, in the Chair. 



The following communications were read : 



I. "O/i the Brom-Iodides/' By Dr. MAXWELL SIMPSON, F.R.S., 

 Professor of Chemistry, Queen's College, Cork. Received 

 November 4, 1873. 



Some years ago I ascertained that chloride of iodine combines directly 

 with the olefmes and the non-saturated haloid ethers in the same manner 

 as free chlorine or bromine. I have since ascertained that bromide of 

 iodine also enters into direct combination with these bodies. 



In the following experiments I have invariably used a solution of 

 bromide of iodine in water, which was prepared by adding rather more 

 than a molecule of iodine in fine powder to a molecule of bromine pre- 

 viously mixed with about six times its weight of water. The bromine 

 was repeatedly agitated during the addition of the iodine, and kept cold 

 by being surrounded by water. An almost black liquid was thus ob- 

 tained, which was separated from the excess of iodine. 



Brom-iodide of ethylene. This body was formed by passing a stream 



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