Objections to the Usual Type of Molecular Formula.-The shortcomings, disadvantages and objections to the usual type of molecular formula are reviewed, and it is shown by calculation back to the batch mixture how the molecular formula may be misinterpreted. New Type of Molecular Formula Proposed.-The following type of an empirical formula is proposed. Advantages of New Type.-The advantages of this new type of formula are that (1) it presents its data in the usual simple and graphic manner; (2)

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... indicates the mineralogical and physical condition in which most of the important constituents are introduced into the batch; (3) i t admits of but little danger of obtaining the wrong batch mixture upon calculation back to the raw materials; and (4) the conclusions to be drawn from it are quite fixed and definite.