454 D'- Herschei/s Experiments on the solar, and 



opd Experiment. 



Sun. Dark-red glass. 



o' 68| 68| 



5 72^ 7o . .. 4i : 1 i = >394 



This red glass stops only 606 rays of heat, and above 4999, 

 out of five thousand, rays of light. 



33d Experiment. 



Sun. Orange glass. 



o' 6 7 i 67^ 



5 74i 7°t • • • 6 i '• 2 f = >396 



This orange-coloured glass stops 604 rays of heat, which is 



nearly as much as is stopped by the last red one ; but it stops 



only 779 rays of light. 



34^/j Experiment. 



Sun. Yellow glass. 



7°i 7°t 



74i 73- • • 3f : 2f = ,667 



It stops 333 rays of heat, and 319 of light. 



25tb Experiment. 



Sun, Pale-green glass. 



o' 70I- 70I- 



5 74i 7H--3i-H = >367 



It stops 633 rays of heat, and only 535 of light. 



36th Experiment. 



Sun Dark-green glass. 



o' 6ft 67i 



5 74i 68i. , .6f :i = ,i5i 



