Mr. J. Murray on Iodine aiid Bromine in Mineral Waters. 283 



fered much loss of intensity, but in all cases a little black oxide 

 has been deposited : this I have no doubt is peroxide, but the 

 quantity is too small to admit of its being examined. 



I remain, my dear Sir, yours faithfully, 



R. Phillips. 



Annexed is Dr. Turner's answer to the foregoing letter. 



My dear Sir, London, Sept. 21, 182y. 



I HAVE examined the specimen of manganese referred to by 

 you in your letter of the 1st of September, and find it quite 

 different from that which you formerly gave me. I agree with 

 you in considering it a definite compound, and readily admit 

 it to be quite distinct both from the peroxide and manganite. 

 In its hio-hly crystalline lamellated structure, as also in its 

 lustre, it nearly resembles manganite; whereas in hardness and 

 in the colour of its powder, it is very similar to the peroxide. 

 Its specific gravity, according to my observation, is 4*531. At 

 a white heat it lost 13.1 1 per cent., of which 5-725 per cent, were 

 water. I am satisfied, therefore, that the discordance in our 

 first set of experiments arose solely from your accidentally 

 sending me, as a specimen of your new oxide, a mineral which 

 was really different. That mixed oxide must I apprehend 

 have contained varvicite, as well as the two other oxides. 



The satisfaction which I feel in so agreeably terminating 

 our discussion on the Warwick ore, is not a little increased 

 by the circumstance of your having confirmed the accuracy of 

 my analysis of manganite. The only point of difference be- 

 tween us now unsettled, respects the coloured solution of man- 

 'ranese in sulphuric acid. I have not yet had leisure to ex- 

 amine this subject fully ; but as the conditions under which 

 our experiments were made are somewhat different, it is likely 

 we may both eventually be found correct. 



I remain, my dear Sir, yours sincerely, 



Edward Turner. 

 To R. Phillips, Esq. 



XLIII. On the Discovery of Iodine and Bromine in the 

 Mineral Waters of England. Biji. Murray, Esq., F.S.A., 

 E.L.S., Sfc. 



To the Editors of the Philosophical Magazine and Annals. 

 Gentlemen, 



DR. DAUBENY has, in your last Number, announced 

 the discovery of iodine and bromine in .some of the 

 mineral waters of England, inter alia those of Cheltenham and 



2 O 2 Gloucester. 



