197 
Expt. XX. — Comparison diffusion contains 14’4 cub. c. in 
500 cub. c. 
A B C D 
1-9 2-15 202 1-77 
The tint given by the theoretical column I thought slightly 
lighter. 
Expt. XXI. — Comparison diffusion contains 19'2 cub. c. 
in 500 cub. c. 
ABO D 
1*55 1‘63 1*59 1*32 
The tint given by the theoretical column I thought slightly 
lighter. 
Expt. XXII. — Comparison diffusion contains 24*0 cub. c. 
in 500 cub. c. 
A B 
1T5 1*3 
0 D 
1*22 1*06 
The tint given by the theoretical column I thought slightly 
lighter, but hardly distinguishable. 
Expt. XXIII. — Comparison diffusions contains 28*8 cub. c. 
in 500 cub. c. 
A B c D 
1*0 1*1 1*05 0*88 
The tint given by the theoretical column I thought slightly 
lighter. 
Expt. XXIV. — Comparison liquid contains 33*6 cub. c. in 
500 cub. c. 
A B C D 
0*88 0*9 0*89 0-76 
The tint given by the theoretical column I thought slightly 
lighter. 
Expt. XXV. — Comparison liquid contains 38*4 cub. c. in 
500 cub. c. 
A B c D 
0*73 0*83 0*78 0*66 
The tint given by the theoretical column I thought slightly 
lighter; they were, however, very nearly the same. 
