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Wein's "Tabellen zur quantitativen Bestimmungder Zuckerarten'' a table is given on page 41, by means of which the starch or dextrin can be directly obtained from the copper found by converting the starch into dextrose and determining the latter with Allihn's solution. This table is based on the factor 0.90, which assumes that the formula of starch is (CGH]0O-)", and that it is all converted into dextrose. Nageli determined the formula of starch to be C3eH6"0., and if this be correct the factor becomes 0.918. Ost, working with the Sacchsemethod decided upon the factor 0.925. In view of all these conflicting data Wiley recommends the factor 0.92, a mean between the two last cited, which will give the analyst fairly accurate results. This factor has been used in the recalculation of the table.

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