. . .se of the following remarks is not to recapitulate the work of other investigators, nor to criticize their conclusions, but to submit a short discussion of the effect upon the chemical reactions involved, of the various physical conditions in which the material may be used.

It is a well known fact that a rosin soap will easily dissolve an equivalent amount of rosin to that which has been saponified, and this extra rosin, whether in solution in the size wax, or whether in suspension in a diluted solution, is still called “free rosin” in the termology of the trade. In order, however, to distinguish between the various states in which the rosin might exist, it should be divided into three classes, consisting first, of dissolved rosin, second, colloidal rosin, and third, rosin in suspension. The reason for this is that before the rosin soap can be used in the art of paper making it must first be brought into dilute aqueous solution.

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