194 TEAN^ACTIOKS AND PROCEEDINGS OF THE [Sess. lviii. 



I will now give the results of seven double experiments, 

 made during March, April, and May 1881 : — 



Taking the totals in each double experiment, the result 

 is as follpws : — 



Total CO, produced. Excess of COg in favour of 



Light. 



Totals. 902-91 c.c. 



918-85 C.C. 



1-72 C.C. 



Obscurity. 

 7-40 C.C. 



4-77 „ 

 2-89 ,. 



1-68" .. 

 0-26 .. 

 0-66 .. 



17-66 C.C. 



Total excess of carbonic anhydride produced in favour of 

 obscurity is 15'94 C.C, or an increase in favour of obscurity 



