TABLE 1 66. 

 INDEX OF REFRACTION. 



Indices of Refraction for the various Alums.* 



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

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



SMITHSONIAN TABLES. 



