12 ON THE ACTION OF TRANSPARENT BOOTES 



35. Copal, Gum. 



Gum Copal acts less powerfully upon green light than crown- 

 glass. 



It acts a very little less powerfully on green light than Jlint- 

 gfass. 



36. Cummin, Oil of. 



This oil acts less powerfully upon green light than oil of la- 

 vender, flint-glass, and crown-glass. 



It acts more powerfully upon green light than balsam of 

 Tolu. 



37. Diamond.. 



When diamond acts in opposition to oil of cassia, the uncor- 

 rected colours are nearly of the same magnitude, and in the 

 same situation, as when the oil of cassia is combined with flint, 

 glass. Hence diamond has nearly the same action upon green 

 light as flint-glass. 



38. Dill Seed, Oil of 



This oil acts less powerfully upon green light than crown- 

 glass. 



It acts a very little less powerfully upon green light than- 

 flint-glass. 



39. Egg* White of an. 



The white of an egg acts more powerfully upon green light, 

 than crown-glass, topaz, muriatic acid, nitric acid, and fluor 

 spar. 



It acts less powerfully upon green light than water, and 

 xxmch less than sulphuric acid. 



40. Ether.. 



