8 ON THE ACTION OF TRANSPARENT BODIES 
15. Almonds, Bitter, Essential Oil of *. 
This oil acts more powerfully upon green light than oi/ of 
cassia, sulphur, and balsam of Tolu. 
It acts less powerfully upon green light than oil of anise- 
seeds, flint-glass, and crown-glass. 
16. Amber. 
Amber acts less powerfully upon green light than crown-glass 
and rock-crystal. 
It acts a little less powerfully upon green light than flint- 
glass. 
It acts less powerfully upon green light than rock-salt. 
17. Amber, Oil of: 
This oil acts less powerfully upon green light than orange- 
coloured glass, oil of lavender, flint and crown glass, topaz, and 
gum-arabic. 
It acts very much more powerfully upon green light than 
oil of cassia. 
It acts more powerfully upon green light than oil of anise- 
seeds. 
18. Ambergris, Oil of: 
This oil acts less powerfully upon green light than topaz, 
rock-crystal, alcohol, and water. 
It acts more powerfully upon green light than oil of cum- 
min. 
19. Anise Seeds, Oil of. 
This oil acts less powerfully upon green light than oil of sas- 
safras, oil of amber, and orange-coloured glass. 
It 
* IT am indebted for this oil to my friend Dr Gornoy. It is a part of that 
which Mr Bnonis used in his interesting experiments on the action of Vegetable 
Poisons, 
