Chapter XIII

IMMUNITY OF THE SKIN AND MUCOUS MEMBRANES 403
Protective function of the skin.—Exfoliation of the epidermis as a
means of ridding the animal of micro-organisms.—Localisation and
arrest of micro-organisms in the dermis.—Intervention of
phagocytes in the defence of the skin.
Elimination of micro-organisms by the conjunctiva.—Microbicidal
function of the tears.—Absorption of toxins by the
conjunctiva.—Protection of the cornea.—Elimination of
micro-organisms by the nasal mucosa.—Protection by the
respiratory channels.—Dust cells.—Absorption of poisons by the
respiratory channels.
Alleged microbicidal property of the saliva.—Part played by
microbial products in the protection of the buccal
cavity.—Antitoxic function of the saliva.
Antiseptic action of the gastric juice.—Antitoxic function of
pepsin.
Protective function of the alimentary canal.—Absence of
microbicidal power from the intestinal ferments.—Protective
function of the bile.—Antitoxic rôle of the digestive
ferments.—Favouring and retarding functions of the intestinal
micro-organisms.—Destruction of toxins by these micro-organisms.
Defensive rôle of the liver. Protective function of the lymphoid
organs of the alimentary canal.
Protective function of the mucous membrane of the genital
organs.—Autopurification of the vagina.

CHAPTER XIV

IMMUNITY ACQUIRED BY NATURAL MEANS 433
Immunity acquired after recovery from infective diseases.—Immunity
acquired in malaria.—Humoral properties of convalescents from
typhoid fever.—Preventive power of the blood of persons who have
recovered from Asiatic cholera.—Antitoxic power of the blood of
persons who have recovered from diphtheria.
Immunity acquired by heredity.—Absence of hereditary immunity
properly so called.—Immunity conferred by the maternal blood and
by the yolk.
Immunity conferred by the milk of the mother.

CHAPTER XV

PROTECTIVE VACCINATIONS 454
Vaccinations against, I. Small-pox.—II. Sheep-pox.—III.
Rabies.—IV. Rinderpest.—V. Anthrax.—VI. Symptomatic
Anthrax.—VII. Swine Erysipelas.—VIII. Pleuropneumonia in the
Bovidae.—IX. Typhoid Fever.—X. Plague.—XI. Tetanus.—XII.
Diphtheria.