162 
B. 
The lime water method will probably be adopted more 
usually, as lime is so common. The experiment is exactly 
the same as with baryta water, but larger bottles are required. 
0'06 carbonic acid in the air gives no precipitate or 
milkiness when \ ounce of lime water is added to a bottle 
of the air, containing 10'9 ounce. 
(=309 cub. cent.) 
0£5 ditto ditto 2*997 ounces. 
(=84-958 cub. c.) 
0-5 ditto ditto T748 ounces. 
(=49*564 cub. c.) 
The author said that by this simple method the greatest 
refinement could be attained. 
