For many years Canada balsam has been the standard mounting medium for most mineralogical and petrographical material, because of its stability, clarity, and ease of preparation, and because its index of refraction is convenient for many purposes. There are certain purposes, however, for which a resin of higher index could be employed to advantage in work of this kind. The purpose of this paper is to discuss the properties of one such resin, hyrax; the methods of preparing mounts with the resin; and several of its possible applications in mineralogy and petrography.

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