He would be more astounded to learn that beneath the appearances, the changes, so alarming him, there are profound alterations in the rate at which he is taking in oxygen, burning up sugar, accumulating carbon dioxide and excreting waste byproducts through the kidneys, which are responsible for them.

Unlike other plants cacti produce carbon dioxide during the day and oxygen during the night.

| 55.54 -+-+-+- NOTE.The carbon monoxide (CO) had failed to remove from the ore the carbon dioxide existing as calcic carbonate.