345 
of the magnetic al Pyrites , See. 
carbon, sulphur, and phosphorus, with one and the same mass 
of iron. These quadruple compounds, which, according to the 
modern chemical nomenclature, may be called carburo-sul- 
phuro phosphurets, or phosphuro-sulphuro- carburets, &c. of 
iron, are as yet unknown as to their chemical properties, and may 
also, by the investigation of their magnetical properties, afford 
some curious results. At any rate, an unexplored field of exten- 
sive research appears to be opened, which possibly may furnish 
important additions to the history of magnetism, a branch of 
science which of late years has been but little augmented, and 
which, amidst the present rapid progress of human knowledge, 
remains immersed in considerable obscurity. 
