ifferent
in composition.

LETTER VI

ALLIANCE OF CHEMISTRY WITH PHYSIOLOGY. Division of Food into
nourishment, and materials for combustion. Effects of Atmospheric
Oxygen. Balance of CARBON and OXYGEN.

LETTER VII

ANIMAL HEAT, its laws and influence on the Animal Functions. Loss
and SUPPLY. Influence of Climate. Fuel of Animal Heat. Agency of
Oxygen in Disease. Respiration.

LETTER VIII

ALIMENTS. Constituents of the Blood. Fibrine, Albumen. Inorganic
Substances. Isomerism of Fibrine, Albumen, and elements of
nutrition. Relation of animal and vegetable organisms.

LETTER IX

Growth of Animals. Uses of Butter and Milk. Metamorphoses of
Tissues. Food of Carnivora, and of the Horse.

LETTER X

Application of the preceding facts to Man. Division of human Food.
Uses of Gelatine.

LETTER XI

CIRCULATION OF MATTER IN THE ANIMAL AND VEGETABLE KINGDOMS. The
Ocean. AGRICULTURE. RESTITUTION OF AN EQUILIBRIUM IN THE SOIL.
Causes of the exhaustion of Land. Virginia. England. Relief gained
by importation of bones. Empirical farming unsatisfactory. Necessity
for scientific principles. Influence of the atmosphere. Of Saline
and Earthy matters of the soil.

LETTER XII

SCIENCE AND ART OF AGRICULTURE. NECESSITY OF CHEMISTRY. Rationale of
agricultural processes. Washing for gold.

LETTER XIII

ILLUSTRATION OF THE NECESSITY OF CHEMISTRY TO ADVANCE AND PERFECT
AGRICULTURE. Manner in which FALLOW ameliorates the soil. Uses of
Lime. Effects of Burning. Of Marl.

LETTER XIV

NATURE AND EFFECTS OF MANURES. Animal bodies subject to constant
waste. Parts separating--exuviae--waste vegetable matters--together
contain all the elements of the soil and of food. Various value of
excrements of different animals as manure.

LETTER XV

SOURCE OF THE CARBON AND NITROGEN OF PLANTS. Produce of Carbon in
Forests and Meadows supplied only with mineral aliments prove it to
be from the atmosphere. Relations between Mineral constituents, and
Carbon and Nitrogen. Effects of the Carbonic Acid and Ammonia of
Manures. Necessity of inorganic constituents to the formation of
aliments, of blood, and therefore of nutrition. NECESSITY OF
INQUIRIES by ANALYSIS to advance AGRICULTURE.

LETTER XVI

RESULTS OF THE AUTHOR'S LATEST INQUIRIES. Superlative importance of
the PHOSPHATES OF LIME and ALKALIES to the cultivation of the
CEREALIA. Sources of a SUPPLY of these MATERIALS.

LETTERS ON CHEMISTRY

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