TABLES 337-338. 

 INDEX OF REFRACTION. 



TABLE 337. Index of Refraction of Quartz (S10 2 ). 



281 



Except Rubens' values, means from various authorities. 



TABLE 338. Indices of Refraction for various Alums.* 



* According to the experiments of Soret (Arch. d. Sc. Phys. Nat. Geneve, 1884, 1888, and Comptes Rendus, 1885). 



t JR stands for the different bases given in the first column. 



For cither alums see reference on Landolt-Bornstein-Roth Tabellen. 



SMITHSONIAN TABLES. 



