( 10 ) 



III. Corresponding Degrees in the 

 Fahrenheit and Centigrade 

 Scales. 



IV. Refractive Indices, Dispersiii 

 Powers, and Polarizii 

 Angles. 



(1.) Kefeactive Indices. 



Diamond 



Phosphorus 



Bisulphide of carbon 



Flint glass 



Crown glass 



Rock salt 



Canada balsam 



Linseed oil (sp. gr. - 932) 



Oil of turpentine (sp, gr. -885) 



Alcohol 



Sea water 



Pure water 



Air (at 0° C. 760 mm.) 



(2.) Dispersive Powebs. 



Diamond 



Phosphorus 



Bisulphide of carbon 



Flint glass 



Crown glass 



Bock salt 



Canada balsam 



Linseed oil (sp. gr. -932) 



Oil of turpentine (sp. gr. -885) 



Alcohol 



Sea water 



Pure water 



Air 



(3.) PoLABiziNO Angles. 



Diamond 



Phosphorus 



Bisulphide cf carbon 



Flint glass 



Crown glass 



Rock salt 



Canada balsam 



Linseed oil (sp .gr. -932) 



Oil of turpentine (sp. gr. -886) 



Alcohol 



Sea water 



Pure water 



Air 



60 



