UPON THE DIFFERENTLY COLOURED RAYS OF LIGHT. 7 



prism, was too small for ascertaining accurately the relative ac- 

 tion of the two bodies. 



It acts less powerfully upon the green rays than water, 

 When it acts in opposition to muriatic acid, no secondary 

 spectrum is perceived* 



11. Acid, Sulphuric. 



Sulphuric Acid acts more powerfully upon the green rays 

 than flint-glass, and affords a secondary spectrum greater than • 

 any other substance. 



It acts more powerfully upon the green light than crown- 

 glass, muriatic acid, rock-crystal, fluor-spar, water, and phospho- 

 ric acid. 



12. Acid, Sulphurous, — water saturated with the gas. 

 Sulphurous Acid acts more powerfully upon green light than 

 flint-glass, crown-glass, rock -crystal, and water. 



13. Alcohol. 



Alcohol acts less powerfully upon the green rays than muria- 

 tic acid and water. 



It acts rather more powerfully upon the green rays than 

 flint and crown glass. 



When it acts in opposition to ether, no uncorrected colour 

 is seen. 



14. Almonds, Oil of. 



Oil of Almonds acts more powerfully upon green light than 

 flint-glass. 



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



glass. 



15. Almonds, 



