203 



TABLES 220, 221 .-ROTATION OF PLANE OF POLARIZED LIGHT. 



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



A few examples are here given showing the effect of wave-length 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 100 grams of the solution. 



c= solvent 



q-=. 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. 21, p. 444- The wave-lengths are for 

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



SMITHSONIAN TABLES. 



