LUMINOSITY OF FLAMES CONTAINING SALT VAPOURS. 
87 
Here F, m and /3 relate to the flame as before. These equations give 
A c 2 —1 = S ( S' 
C 1+aAc 1+a'Ac 
where c is taken equal to unity when 
S = S' = 0. 
Let 10 4 & = GS, 10 4 F = G'S', b = GA, V — G'A, a = GaA 2 , and a' = GVA 2 , so that 
c 2 -l = lO 4 ^ 10 4 F 
c b + ac ‘ b' + a'c' 
To test this equation the conductivity, due to a solution of 9'06 gr. Na 2 C0 3 and 
0T64 gr. K 2 C0 3 in a litre, was compared with that due to a solution of 18T2 gr. of 
Na 2 C0 3 in a litre. The first solution gave a conductivity equal to 1'06 times that of 
the second. For the second solution c = 30'3, so that c for the mixture was 32'2. 
The above equation gives c = 31'55. The sum of the conductivities due to the Na 2 C0 3 
and K 2 C0 3 when not mixed is 44'6. 
VOL. CCXVI.-A. 
N 
