You will be astonished when I tell you what this curious play of carbon amounts to. A candle will burn some four, five, six, or seven hours. What, then, must be the daily amount of carbon going up into the air in the way of carbonic acid! … Then what becomes of it? Wonderful is it to find that the change produced by respiration … is the very life and support of plants and vegetables that grow upon the surface of the earth.
