1-00033 



1-382 



412 On Light. 



Index of Refraction. 



A vacuum, 1 00000 



Atmospheric air, 



(meau,) 

 Ice, W. 1-31000 



Ice, Brewster, 1-30700 



Water, -\ * 1-336 



Vitreous vCryo- 



humour, J lite. B. 1-344 

 Ether, Wol. 1-358 



Albumen, W. 1-360 



Alcohol, W. 1-370 



Saturated ^ 



solution > Cavallo, 1-375 



of salt, ^ 

 Solution of sal am-1 



moniac, J 



Nitric acid, sp.gr.T,y ,..q 



1-48, J* • 



Fluorspar, W. 1-433 



Sulphuric spar, W. 1-435 

 Spermaceti melted, W. 1-446 

 Crystalline lensl ^^ 1-447 



of an ox, J 

 Alum, W. 1-457 



Tallow melted, W. 1-460 

 Borax, C. 1-467 



Oil of lavender, W. 1-467 

 C. (1-469) 

 Oil of peppermint, W, 1-468 

 Oil of olives, W. 1-469 



Oil of almonds, W. 1-470 

 Oil of turpentine, "l^y^ j.^^-q 



rectified, j 



Do. common, W. 1-476 



Essence of lemon, W. 1-476 

 Butter, cold, W. 1-480 



Linseed oil, W. 1-485 



Camphor, W. 1-487 



Iceland spar, 1 ^^^ j.^gg 



weakest reir.J 

 Do. strongest do. W.( 1-657) 

 Tallow, cold, W. 1-49 



Sulphate of potash, W. 1-495 

 Oil of nutmeg, W. 1-497 



French plate-glass, W, 1*500 



Index of Refraction. 

 English plate-glass, W. 1-504 

 Oil of amber, W. 1-505 



Balsam of capivi, VV. 1*507 

 Gum-arabic, W. V-514 



Dutch plate-glass, W. 1-517 

 Caoutchouc, W. 1-524 



Nitre, C. 1-524 



Selenite, W. 1-525 



Crown glass, com. W. 1-525 

 Canada balsam. 

 Centre of the cry- 

 stalline of fish, 

 and dry crystal- 

 line of an ox, 

 Pitch, 

 Radcliffe crown- 



} 



glass, 

 Anime, 

 Copal, 



Oil of cloves. 

 White wax, cold, 

 Elemi, 

 Mastic, 



Arseniate of potash, \W. 

 Sugar after fusion. 

 Spermaceti, cold. 

 Red sealing-wax. 

 Oil of sassafras. 

 Bees-wax, 

 Boxwood, 

 Colophony, 

 Old plate -glass. 

 Rock crystal, 



(double,) 

 Amber, 



W. 1-528 



W. 1-530 



W. 



W. 1-533 



W. 1-535 

 W. 1-535 

 W. 1-535 



} 



W. 1-536 

 W. 1-542 

 W. 



W. 1-543 

 W. 1-545 



W. 1-547 



Opium, 

 Mica, 



Phosphorus, 

 Horn, 



Flint-glass, 



Benzoin, 

 Guaiacum, 

 Balsam of Tolu, 



VV. 1-547 

 C. (1-556) 

 W. 



w. 

 w. 

 w. 



1-579 



w 



1-583 



1-586 



W. 



W. 1-596 



W. 1-600 



Sul- 



