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 flint-glass. 
When opposed to crown-glass, 1 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 
