UPON THE DIFFERENTLY COLOURED RAYS OF LIGHT. 5 



It acts less powerfully upon the green rays than crown^ 

 glass. 



5. Acid, Muriatic. 



Muriatic Acid acts much more powerfully upon green light 

 that Jlint-glass. 



It acts more powerfully upon green light than crown-glass. 



It acts less powerfully upon green light than rock-crystal. 



It acts less powerfully upon green light than water. 



It acts very much less powerfully upon green light than sul- 

 phuric acid. 



6. Acid) Nitric. 



Nitric acid acts much more powerfully upon the green rays 

 than Jlint-glass. 



It acts a little more powerfully upon the green rays than 

 crown-glass. 



It acts much less powerfully upon the green rays than sul~ 

 phuric acid. 



1. Acid, Nitrous. 



Nitrous acid acts much more powerfully upon green light 

 than Jlint-glass. 



It acts less powerfully upon green light than topaz. (Not a 

 good observation.) 



It acts less powerfully upon green light than rock-crystal. 



It acts less powerfully upon green light than nitric acid. 



It has nearly the same action upon green light as crown- 

 glass ; an uncorrected green fringe appearing towards the 

 vertex of the nitrous acid prism, when it is inclined to the in- 

 cident ray, and towards the vertex of the crown-glass prism, 

 when it is placed first, and inclined to the incident ray. The 

 fringe is, however, greater in the latter case, and therefore the 



acid 



