The author has recently had to make a great number of determinations with ten to twenty Cc. portions of organic solvents, and this simple piece of apparatus has been devised for the recovery of these small portions after their evaporation. --TOSUCTIO~ -------T Ordinary methods of distillation are not satisfactory here, because it is extremely difficult to remove all the residue from a distilling flask, and in such determinations, it is the residue that is important. Moreover, it is not at all

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... ndy to take the time required for such an operation. The ordinary laboratory method, as a rule, is to evaporate the solvent on the steam bath, in an evaporating dish with the subsequent loss of the solvent. This is an expensive procedure, where the amount of solvent lost would average a liter or two a week.