Chapter XVII

SUMMARY 544
Means of defence of the animal against infective
agents.—Absorption of micro-organisms.—Phagocytes, and their
function in inflammation.—The action of phagocytes in the
absorption of micro-organisms.—The cytases, phagocytic
ferments.—The cytases are closely bound up with the
phagocytes.—The fixatives and their function in acquired
immunity.—The fixatives are excreted by the phagocytes and pass
readily into the fluids of the body.—Essential mechanism of the
action of the fixatives.—Adaptation of phagocytes to destroy
micro-organisms in acquired immunity.—Difference between the
fixatives and the agglutinins.—Antitoxins and their analogy with
the fixatives.—Hypotheses as to the origin of
antitoxins.—Cellular immunity is a fact of general
import.—Susceptibility and its rôle in immunity.—Applications of
the theory of immunity to medical practice.

INDEX 571