vided it be based upon sound acid in Britain now uses pyrites as the source of sulphur. rubber. I was not surprised when, upon attempting to ar- During my experience of fifteen years in England, I have range these cranks as in Prof. Lyman’s apparatus, so as to as though he wore a professor’s gown.… … very costly, while by using it sulphur may be obtained at from one fourth to one third the cost of sulphur derived from brimstone. The quality of the sulphuric acid produced from pyrites is as good as that from brimstone, provided proper precautions are adopted to separate the arsenic, which may be…
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