on the terrestrial Rays that occasion Heat. 475 



111$ Experiment. 



Red rays. Violet glass. 



o' 57% 57 



5 59i 5H • • • *! '• H = > 6o ° 



It stops 400 rays of the same sort of heat. 



112th Experiment. 



Red rays. Crown glass ; one side rubbed on emery, 



rough side exposed. 



o' 49i 49 



5 52 50f ...2i:if = ,611 



This glass, so prepared, stops 389 scattered rays of the same 

 sort of heat. 



113^ Experiment. 



Red rays. Coach glass ; one side rubbed on emery, 



rough side exposed. 



9' 53f SH 



5 55i 53i • • • H • f = >5°o 



It stops 500 scattered rays of the same sort of heat. 



114^ Experiment. 



Red rays. Crown glass ; both sides rubbed on emery. 



°' 5°i A9i 



5 52f 51 . . . 2|: ii = , 5 29 



It stops 471 scattered rays of the same sort of heat. 



115^ Experiment. 



Red rays. Coach glass ; both sides rubbed on emery. 



°' 541 53i 



5 55f 54 • • • i£ • i = ,167 



It stops 833 scattered rays of the same sort of heat. 



