FLUID CRYSTALS 



179 



the fluid becomes wholly isotropous ; it gains all the physical 

 properties attributed to, and of what we regard as, a true fluid. 



TABLE B. — Potential Fluid Crystalline Substances 

 (Modified from Schenck, with additions) 



In this intermediate stage, then, we deal with crystalline 

 fluids, and the individual crystals are " fluid crystals " — though 

 here a distinction is drawn bv Lehmann and Schenck between 

 " flowing " or ductile crystals (fliessende Kristalle) and " fluid ' 

 (flussige) crystals proper (Plate III. Fig. 2). The former we 

 encounter in crystalline fluids of the thicker, less fluid type, the 

 latter in the more watery fluids. The former, under the micro- 

 scope, are of definitely crystalline structure, needle-shaped or 



