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X. Analysis of Corundum, and of some oj the Substances which 
accompany it; with Observations on the Affinities which the 
Earths have been supposed to have' for each other, in the humid 
Way . By Richard Chenevix, Esq. F . R. S. and M. R , L A. 
Read May 20, 1802. 
§ I- 
Some kinds of corundum, such as the adamantine spar of 
China, and the sapphire, have already been analyzed by Mr, 
Klaproth. This would have rendered any further experiments 
unnecessary, were it not, that I have had at my disposal many 
kinds of corundum he did not possess, and also some substances 
accompanying it, which were unknown before the preceding 
communication of the Count de Bournon. 
As, from the result of my analyses, it appears that all the 
different kinds of corundum are nearly similar in their consti- 
tuent parts, and differ only in their proportions, it would be 
tedious to mention every experiment I made upon each kind. 
I shall therefore confine myself to stating, once for all, such 
modes of analysis as were employed with stones of a similar 
nature ; and then present a summary of the results : lastly, I 
shall conclude with an enquiry into a much contested point, 
which lately threatened a revolution in docimastic chemistry. 
A principal character of corundum in general, as may be 
found in the Count de Bournon's mineralogical description, is • 
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