8 CN THE ACTION OF TRANSPARENT BODIES 



15. Almonds, Bitter, Essential Oil of*. 



This oil acts more powerfully upon green light than oil qj 

 cassia, sulphur, and balsam of Tolu. 



It acts less powerfully upon green light than oil of anise- 

 seeds, jiint-glass, and crown-glass. 



16. Amber. 



Amber acts less powerfully upon green light than c?*own-glas$ 

 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 



* I am indebted for this oil to my friend Dr Gordon. It is a part of that 

 which Mr Brodie used in his interesting experiments on the action of Vegetable 

 Poisons. 



