In mineralogical analysis, and to a lesser extent, in rock analysis, the average laboratory worker is seldom in a position to undertake extensive researches into the field of devising new or unique methods for the determination of any particular constituent. He does, however, owing to paucity of available sample, have to display in many cases, considerable ingenuity in combining standard methods in such a way as to determine a large number of constituents on the same very small portion of material. The care with which these involved combinations must be used is emphasized by the fact that, in many instances, no second portion of the sample can be obtained in case of accident or error.

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