The reference-intensity-ratio method of quantitative X-ray diffraction is rapidly coming to the forefront of quantitative X-ray powder difraction analysis. Pawloski (1985) has completed quantitative analysis of prepared mixtures of fine-grained geologic materials by this procedure. Pawloski is to be commended for using this approach and for her method of obtaining reference-inten-sity constants from calibration curves by the intensity ratio/weight ratio slope method. Nevertheless, I believe that several experimental and interpretive difficulties arise in this paper and bring into question the application to Pawloski’s samples, which I feel warrants some discussion here.

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