TiCHBORNE — On an Argentiferous Qalenetic-hlende. 305 



In the five analyses given in Mr. Argall's Paper there is a great 

 discrepancy of composition ; thus : the lead varies from 7|- to 26 per 

 cent. ; the zinc from 8 to 49 per cent., and, where estimated, the 

 silver respectively 4, 6, and 7^ ozs. This great variation in com- 

 position is easily understood when we note the iron; for we find 

 that one sample, marked " E," must have contained about 23 per 

 cent, of pyrites ; sample *' A" 32 per cent., and sample " C " more 

 than half pyrites. 



The samples examined by me contained more silver than the 

 highest estimation given in these analyses. 



In concluding this short notice of this ore, I am tempted to 

 quote from my report upon the Dublin International Exhibition of 

 1865.^ In giving the statistics of the raising of silver in Ireland 

 I stated that this county was a large supplier of the valuable metal, 

 but I am afraid to make the calculation now which I did at that 

 period. I then stated that Ireland produced 14,000 ounces of 

 silver per annum, or 2*4 per cent, of the whole of the silver raised in 

 the world, and its value might be estimated at £3,850 per annum, 

 exclusive of the lead raised at the same time. If 1,000 tons of this 

 argentiferous ore can be sighted, which represents of silver alone 

 8,000 ounces, how lamentable it seems that this valuable industrial 

 resource should remain unworked — mere earth which might be 

 transmuted into bone and sinew. 



1 Chemical News, July, 21, I860 : Report upon the Dublin Exhibition, and Official 

 Report, by C. R. Tichborne. 



SCIHir. PROC. R.D.S. — VOL. IV. PT. Tl. 2E 



