Fig. 400, 401. Crystals of Tartaric Acid.

Fig. 400. the crystal as usually modified. (The corresponding planes in both figures are marked with the same letters.)
Fig. 401. The same modified form, with the planes irregularly deposed, as they appear in most of the crystals.

This image is from _ in Pereira's Elements of Materia Medica and Therapeutics, 1854.