OP ARTS AND SCIENCES. 105 



Analysis of Antimonious Oxibromide. 

 Prepared with Alcohol. 



Weight taken. ^'otlained"^^^' % «f I^^«™i"«- 



0.6634 0.3424 21.96 



Theory for Sb.O.Br^ when Sb = 120 22.22 



Several attempts were made to prepare SbOBr, by using a larger pro- 

 portion of antimonious bromide as compared with the alcohol, accord- 

 ing to the indications furnished by SchaefFer's experiments with 

 antimonious chloride ; but the product was uniformly Sb^O^Brg ; nor 

 have we been, as yet, more successful in isolating the compound in 

 other ways.* An analysis of the white amorphous precipitate formed 

 by the action of water ou antimonious bromide showed that it also 

 consisted essentially of the same, Sb405Br2. The following result was 

 obtained by Mr. Richardson : — 



Analysis of Antimonious Oxibromide. 

 Precipitated by Water. 

 Weight taken. ^'^fitl'n^ed.^^' % of Bromide. 



0.2281 gramme. 0.1155 21.54 



Antimonious Oxichlorides (SbOCl and Sb^OgClg). 



These two compounds were prepared in a crystalline condition by 

 following the directions given by SchaefFer in the paper already referred 

 to. The crystals of SbOCl were not described by Schaeifer. Those 

 obtained by Mr. Richardson were from half a millimetre to a millimetre 

 in length, and enabled us to determine their crystallographic dimen- 

 sions with approximate accuracy. They were evidently monoclinic, 

 and presented the planes of an oblique rhombic prism with a klino- 

 dome and pinacoids. 



* We also tried to prepare crystallized oxi-iodides of antimony by Schaeffer's 

 method, but without success. A solution of antimonious iodide in absolute 

 alcohol yields, without heating, an abundant precipitate of oxi-iodide, but as a 

 perfectly amorphous powder. The material was evidently a mixture of the two 

 oxi-iodides we have distinguished. Analysis gave for one preparation 46%, and 

 for another 40.58%, of iodine. 



