Carbonic acid is taken from the water and synthesized (by the mediation of light energy) into carbohydrate.
The quantities of oxygen and carbonic acid in the sea are nearly constant so far as we can determine.
The presence of carbonic acid in a water does not affect its action on lead.
There is reason to believe that carbonic acid is always one of these waste products, while the others contain the remainder of the carbon, the nitrogen, the hydrogen and the other elements which may enter into the composition of the protoplasm.
Another fact of considerable technical importance is, that the various races of yeast show considerable differences in the amount and proportion of fermentation products other than ethyl alcohol and carbonic acid which they produce.
