Tables 220, 221 .- ROTATION OF PLANE OF POLARIZED LIGHT. 203 



TABLE 220. — Tartaric Acid ; Camphor ; Santonin ; Santonin Acid; Cane Sugar. 



A few examples are here given showing the effect of wave-lengih on the rotation of the plane of polarization. The 

 rotations are for a thickness of one decimeter of the solution. The examples are quoted from Landolt & Born- 

 stein's "Phys. Chem. Tab." The following symbols are used ; — 



/ = number grams of the active substance in loo grams of the solution. 

 f=r " " solvent " " " " 



9=: " " active " " cubic centimeter " 



Right-handed rotation is marked +, left-handed — . 



TABLE 221. — Sodium Chlorate ; Quartz. 



* The paper is quoted from a paper by Ketteler in " Wied. Ann." vol 

 the Fraunhofer lines. Angstrom's values for the ultra violet sun, and Cornu's 



Smithsonia."* Tables. 



, 21, p. 444. The virave-lengths are for 

 values for the cadmium lines. 



