Fig. 109.—A Crystal of Ammonium Oleate A, broken at B, each part repairing itself at C, perfect again at D.
An extremely interesting experimental observation of Lehmann’s with the bipyramids of ammonium oleate is, that if one of them, for instance A in Fig. 109, be broken into two parts, as at B, each part grows again and completely repairs itself, becoming once more a perfect double pyramid, as indicated in stages at C and D in the figure.
Fig. 110.
Fig. 111.
Cruciform, Boomerang, and Arrow-head Twins of Ammonium Oleate.
PLATE XXII.
Fig. 104.
Dichroic Crystal Drops of Para-azoxy-anisol.
Fig. 112.
Rectilinear Liquid Prisms of Para-azoxy-benzoic Acid.