620 Scientific Proceedings, Royal Dublin Society. 



To make twenty gross of mineral water, or fifteen gross of 

 brandy bottles, which is the quantity usually run from a fur- 

 nace : — 



18 cwt. Antwerp sand. 



4^ „ chalk (or whiting). 



2 ,, soda ash. 



2 „ sulphate of soda. 



4 lbs. red lead. 



2 ,, arsenic. 



2 „ manganese. 



About 1 ton of waste glass, such as broken window-glass. 



The " Granuloid," when used, is thrown in, in the block, which 

 rapidly melts down. 



A rock very similar in aspect to the "Granuloid" occurs in 

 the Howth Promontory, also in places in the counties Wicklow, 

 Wexford, and elsewhere in Ireland. — (B. Clarke.) 



