10 ON THE ACTION OF TRANSPARENT BODIES. 



25. Glass of Borax. 



Glass of Borax acts more powerfully upon green light than 

 flint and crown-glass^ 



26". Calcareous Spar. 



Calcareous Spar acts less powerfully upon green light than 

 topaz and rock-crystal. 



It acts more powerfully upon green light than f bit-glass. 



When opposed to crown-glass, I have not been able to per- 

 ceive distinctly any uncorrected colours. 



27. Canada Balsam. 



Canada Balsam acts less powerfully upon green light than 

 flint and crown glass. 



It acts more powerfully upon green light than oil of cloves. 



28. Capivi, Balsam of 



This balsam acts less powerfully upon green light than 

 crown-glass. 



It acts more powerfully upon green light than oil of marjo- 

 ram. 



When it disperses in opposition to flint-glass, no secondary 

 spectrum is visible. 



29. Caraway-Seeds, Oil of. 



This oil acts less powerfully upon green light than crown 

 and flint glass. 



30. Carbonate of Lead. 



This metallic salt acts more powerfully upon the green rays 

 than oil of cassia. 



It 



