on the terrestrial Rays that occasion Heat. 495 



l%%d Experiment. 





Stove. Dark-blue glass. 





O' 



5 



It stops 632 



53i 53 



551- 53i • • • H '■ I = 

 invisible rays of heat. 



iS/^tb Experiment. 



Stove. Indigo glass. 



= ,368 



0' 



54i 54 





3 



5.9l 55i • • • 5# : ij : 



= ,341 



It stops 659 invisible rays of heat. 



185th Experiment. 



0' 



3 

 It stops 700 



Stove, Pale indigo glass. 



53j 53i 

 59i 55f---6i:i£ : 

 invisible rays of heat. 



186^ Experiment. 



= >3oo 



0' 



3 



Stove. Purple glass. 



5 6 § 5H • • • 4>i '• H ■ 



= ,270 



It stops 730 invisible rays of heat. 



187^ Experiment. 



Stove. Violet glass. 



o' 51 5H 



3 55i 53 • .-4i'- *|- = >3 10 " 



It stops 684 invisible rays of heat. 



3 S2 



