UPON THE DIFFERENTLY COLOURED RAYS OF LIGHT. Ti 
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-crysta!, fluor-spar, water, and phospho- 
ric acid. 
12. Acid, Sulphurous,—water saturated with the gas. 
Sulphurous Acid acts more powerfully upon green light than: 
Alint-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 
Jlini-glass.. 
It acts a little less powerfully upon green light than crown-. 
glass. 
S 
15... Almonds, 
