The Plant takes in, water, by its roots; carbonic acid, by its leaves; nitrogen, in the form of ammonia and nitric acid; minerals, in the form of phosphoric acid, lime, common and other salts, from the soil.

The Animal takes in, water, starch, fat, gluten, and mineral matters, in the form of vegetable and animal food, into its stomach; and oxygen into its lungs.

The Soil takes in, urea and other animal excretions, dead animals and plants.

The Plant produces, oxygen, from its leaves; sugar, starch, gluten, and mineral matters, in its sap and solid substances.

The Animal produces, car-bonic acid and water, which are exhaled from the skin and lungs; urea, phosphates, and other salts, in the excretions; the fat in the body, which is in time breathed away in the form of carbonic acid; water and perfect muscle, bone, blood, and tissues, to build and repair the body.

The Soil produces, carbon in the form of wood and coal, and in spring water; ammonia, nitric acid, and other nitrogenous compounds; phosphoric acid, lime, common salt, and other mineral matters.

So the movement is circular; the beginning is the end. A marvellous commerce appears; soil, plant, and animal commingling; the elements of each being at different times the elements of all, and their interchange perpetual.