umn days when the air is
like wine; but God meant it to be our daily portion, and this very
despised knowledge of cookery is to bring it about. If a lung is
imperfect, supplied only with foul air as among the very poor, or diseased
as in consumption, food does not nourish, and you now know why. We have
found that the purest air and the purest water contain the largest
proportion of oxygen; and it is this that vitalizes both food and, through
food, the blood.

To nourish this body, then, demands many elements; and to study these has
been the joint work of chemists and physiologists, till at last every
constituent of the body is known and classified. Many as these
constituents are, they are all resolved into the simple elements, oxygen,
hydrogen, nitrogen, and carbon, while a little sulphur, a little
phosphorus, lime, chlorine, sodium, &c., are added.

FLESH and BLOOD are composed of water, fat, fibrine, albumen, gelatine,
and the compounds of lime, phosphorus, soda, potash, magnesia, iron, &c.

BONE contains cartilage, gelatine, fat, and the salts of lime, magnesia,
soda, &c., in combination with phosphoric and other acids.

CARTILAGE consists of chondrine, a substance somewhat like gelatine, and
contains also the salts of sulphur, lime, soda, potash, phosphorus,
magnesia, and iron.

BILE is made up of water, fat, resin, sugar, cholesterine, some fatty
acids, and the salts of potash, iron, and soda.

THE BRAIN is made up of water, albumen, fat, phosphoric acid, osmazone,
and salts.

THE LIVER unites water, fat, and albumen, with phosphoric and other acids,
and lime, iron, soda, and potash.

THE LUNGS are formed of two substances: one like gelatine; another of the
nature of caseine and albumen, fibrine, cholesterine, iron, water, soda,
and various fatty and organic acids.

How these varied elements are held together, even science with all its
deep searchings has never told. No man, by whatsoever combination of
elements, has ever made a living plant, much less a living animal. No
better comparison has ever been given than that of Youmans, who makes a
table of the analogies between the human body and the steam-engine, which
I give as it stands.

ANALOGIES OF THE STEAM-ENGINE AND THE LIVING BODY.

_The Steam Engine in Action takes_:

1. Fuel: coal and wood, both combustible.

2. Water for evaporation.

3. Air for combustion.

_And Produces_:

4. A steady boiling heat of 212 deg. by quick combustion.