on the terrestrial Rays that occasion Heat. 511 







Table 



III. 





r 



Empty tube and s 

 Spring water 

 Sea water 



\ glasses stop 542 rays 



- - - 558 - 

 - - 682 



of heat, and 



204 of light. 

 211 - 



288 - - 



Spirit of wine 

 Gin 



- 



- - 612 

 - 739 



- 



- - 



224 - - 

 626 - - 



Brandy 



- 



79* 



- 



- 



996 - - 



To which may be joined, a table containing the stoppages 

 occasioned by scattering substances. 





Table IV. 



„. 



Rough crown glass stops 



i 464 rays of heat, and 854 



Rough coach glass 



57i - 



- - 879 



The 1st doubly rough - 



■ 66y 



- 93 2 



The 2d doubly rough - 



735 - 



- 94> 6 



The 2 first together - 



698 - 



- 9 6 9 



The 2 next together - 



800 - 



- 979 



The 4 first together 



854 - 



- 995 



Olive colour, burnt in - 



839 



- 984 



Calcined talc 



867 - 



- 99 6 



White paper - 



,850 



- 994> 



White linen - 



916 - 



- 95* 



White persian - 



760 



- 9 1 ® 



Black muslin 



7H - 



- 7S7 



We shall now enter more particularly into the subject of 

 these four tables, that we may, if possible, find a criterion 

 by which to judge whether heat and light can be occasioned 



3 U 2 



