The final hand grinding of petrographic thin sections presents many difficulties and frequently many slides are ruined before the necessary technique is developed. The writer, after many unsuccessful attempts to consistently produce good slides, has noted two possible causes of failure: (1) insufficient observation of the progress of the grinding, and (2) curvature of the glass grinding plates. Although the remedial methods given here may be in use, the writer is not aware of mention of them in the literature.

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