UPON THE DIFFERENTLY COLOURED RAYS OF LIGHT.. is 
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 . 
Jfint-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 
fiint and crown glass. 
It acts less powerfully upon green light than topaz. 
56. Marjoram, Oil of: 
This-oil acts less powerfully upon green light than flint and - 
crown 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 flint and — 
crown glass. 
It acts more powerfully upon green light than oil of sassa-. - 
fras. 
