Sentence:  The microscopically small crystals often obtained by very rapid cooling of the hot solution, appeared to be no crystals of the optically active form either; they were rhombic individuals exhibiting prismatic, <WSD>domatic</WSD> and basal facets, of a new hydrate of the racemic compound, probably at higher temperatures stable, and containing less water of crystallization. 
Meaning of the word marked with <WSD> tags:  Having only one plane of symmetry.