on the terrestrial Rays that occasion Heat. 467 



j6tb Experiment. 



Candle. Pale-blue glass. 



o' 6ii $l£ 



5 64J- 6a£ ...2^:ii=,39i 



It stops 609 rays of flame-heat. 



*jjth Experiment. 



Candle. Dark-blue glass. 



o' 6i£ 6i| 



5 £41. 6a* ...2f :i = ,38i 



It stops 6ig rays of flame-heat. 



j8tb Experiment. 



Candle. Indigo glass. 



It stops 679 rays of flame-heat. 



79^/6 Experiment. 



Candle. Pale indigo glass. 



o' 62% ()2-| 



5 %| 6 3 i...2f :ii = ,42 9 



It stops 571 rays of flame-heat. 



80th Experiment. 



Candle. Purple glass.' 



o' 6i|- ftif 



£ 65 %f • • • S| : if = ,480 



It stops 520 rays of flame-heat. 



