or THE MEADOW-SWESr. 165 



obtained by agitating the aqueous solution of hydrospiroilic acid with 

 solution of bromine ; it is immediately precipitated in white flocks : the 

 supernatant liquid is colourless, has no smell, and contains hydrobromic 

 acid. In order to free the bromide of spiroil from excess of bromine 

 and hydrospiroil, it must be kept melted in a water-bath so long as 

 acid fumes are given off. Bromide of spiroil is exactly similar to the 

 chloride of spiroil in all its properties ; it is quite insoluble in water, 

 and is easily soluble in aether and alcohol. By the spontaneous evapo- 

 ration of the alcoholic solution it is obtained crystallized ; bromide of 

 spiroil melts at a rather higher temperature than the chloride, and like 

 the latter may also be entirely sublimed : when boiled with water it 

 evaporates unaltered. Its behaviour, -tvith regard to the saline bases, 

 is exactly the same as chloride of spiroil, but the alkaline salts are more 

 difficultly soluble : 0'480 grm. bromide of spiroil dissolved in potaslx 

 and decomposed by nitric acid yielded only 0-02 bromide of silver. 



I. 0*5 10 grm. fused bromide of spiroil yielded 



0*690 carbonic acid = 190*78 carbon. 

 0*510 water = 13*11 hydrogen. 



Further, by solution as above-mentioned in pure caustic potash, and 

 combustion of the compound formed, 0*510 grm. bromide of spiroil 

 became 0*4'85 bromide of silver = to about 0*2036 bromine. 



Carbon 190*78 37*41 



Hydrogen 13*11 2*57 



Oxygen 192*41 20*02 



Bromine 203*60 40*00 



510,00? 100*00 



II. 0*325 grm. bromide of spiroil yielded 



0*457 grm. carbonic acid = 126*00 carbon. 

 0*081 water = 8*99 hydrogen. 



III. 0*305 grm. bromide of spiroil yielded 



0*409 grm. carbonic acid = 11300 carbon. 

 0*071 water = 7*88 hydrogen. 



If the proportions of bromine in I. be taken, we obtain in 100 parts 



I. 



Carbon 38*77 37*05 



Hydrogen 2*72 2*55 



Oxygen 18*51 20*40 



Bromine 40*00 40*00 



100*00 100*00 



