UPON THE DIFFERENTLY COLOURED RAYS OF LIGHT. 15~ 



52. Juniper, Oil of. 



This oil acts less powerfully upon green light than crown- 

 glass. 



It acts a very little more powerfully upon green light than 

 flint-glass. 



53- Lavender, Oil of. 



This oil acts less powerfully upon green light than flint and 

 crown glass. 



It acts more powerfully upon green light than oil of cassia, 

 balsam of Tolu, and oil of amber* 



54. Lemon, Oil of. 



This oil acts less powerfully upon green light than crown- 

 glass, and a very little less powerfully than flint -glass. 



55. Leucite. 



This mineral acts more powerfully upon green light than 

 flint and crown glass. 



It acts less powerfully upon green light than topaz* 



56. Marjoram, Oil of 



This oil acts less powerfully upon green light \hoxi flint and 

 croxvn glass, and nut oil. 



57. Muriate of Antimony. 



This fluid, (the dispersive power of that which I used was 

 0.059,) acts far less powerfully Upon green light than^mif and 

 crown glass. 



It acts more powerfully upon green light than oil of sassa~> 

 fras* 



% 



