At the petrographic laboratory of the University of Kansas, it was found that a reference set of detrital mineral slides, purchased from a British firm some twelve years ago, had become unusable through deterioration. fn many the balsam was badly cracked and discolored, and in some the cover glasses had separated and fallen off. A search of the standard manuals found instructions only for repairing thin sections, hence it was found necessary to work out some modified procedure applicable to detrital mineral mounts. Three possible methods suggested themselves: (1) Mechanical separation and remounting of the grains. This would entail separation and disintegration of the original mount, removal of mineral grains by hand picking, and transfer to a new slide. (2) Chemical separation of grains and remounting. This would involve removal of old balsam by solution in xylol, or by treatment with some chemical, such as acetone, leaving the residual mineral grains available for remounting. (3) Treatment of the original mounting material to restore its serviceability. The latter method was selected as most promising of convenience and rapidity, and the following procedure was evolved through trial and error. It is passed on with the hope that other geologists may be spared the loss of time and materials entailed by experimentation.

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