In most cases the whok six determinations agree so closely that all the results come easily within the limit of error, and the separation into the two sets of determinations is purely for the purpose of comparison. The preceding table shows a few of the results of the separate determinations. LVe can only conclude that, while ignition of meats in a closed muffle causes a loss of phosphorus, the ignition in open crucibles with only a moderate heat will not cause the loss of an appreciable amount

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... of phosphorus. However, as Leavitt and LeClerc' have shown, too much care cannot be exercised in the digestion of the ash so as to put all the phosphorus in a form that will be precipitated by the ammonium molybdate. This seems to be most surely accornplishe A by the Neumann2 method of digestion with equal volume of sulphuric and nitric acids; or by long (8 to IO hours) digestion with nitrohydrochloric acid. Credit is here given Mr. Norman Hendrickson for his assistance in the laboratory work.