Goniometric study. For measurements, the crystals were adjusted acording to the most developed belt, indicated on the attached diagram by the symbol [0121]. A total of 17 crystals were measured, of which six were used for calculating calculating the φ and ρ coordinates (see the article). Optical investigation of the crystals of 1-phenyl-2-parachlorophenyl-3-fenchyl-imidoxantide on E. S. Fedorov's universal stage established the following orientation of the axes of the optical ellipsoid: the NgNp plane coincides with the cleavage plane (1000), and Np coincides with the direction of crystal elongation, i.e. [0121].