Explanations of the crystal habit modifying powers of certain dyes have usually depended on the adsorption, by means specified or unspecified, of the dye molecules by the growing crystal. The present work has confirmed the importance of dye adsorption in crystal habit modification phenomena. Studies of modified crystals in which dye adsorptions, followed by overgrowth of the dye molecules, have occurred to give pleochroic dye inclusions have indicated, however, that adsorption is not necessarily on the habit modified plane. More frequently it is perpendicular to the modified face of the crystal, which is very reasonable if modern views on the layerwise growth processes of crystal faces are accepted.It was assumed that the polar groups of dye molecules were responsible for the adsorption of dyes by growing crystals, and a considerable weight of evidence has been obtained to support the view that adsorption is due to a close similarity in pattern between the polar groups in a dye molecule and the ions of a crystal plane. The type of crystal c PXIS FIG. 1.
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