on the terrestrial Rays that occasion Heat. 473 



101st Experiment. 



Red rays. Orange glass. 



°' 75 14k 



5 77 75\ • • • 2 : 1 = ,500 



It stops 500 rays of the same sort of heat. 



102a 1 Experiment. 



Red rays. Yellow glass. 



75% 75 



7H 7&.-.if:J =^,583 



It stops 417 rays of the same sort of heat. 



103d Experiment. 



Red rays. Pale-green glass. 



o' 74i 74i 



5 7^1 75... 2|: I- = 412 



It stops 588 rays of the same sort of heat. 



104^ Experiment. 



Red rays. Dark-green glass. 



o' 68£ 68£ 



5 7°i 6 5 i...i|:| = ,2i4 



It stops 786 rays of the same sort of heat. 



105th Experiment. 



Red rays. Bluish-green glass. 



o' 69 68£ 



5 7°i ^f...i|:f = ,538 



It stops 462 rays of the same sort of heat. 



