g 1. Idea of Species • . 78
General Characteristics. — Definitions 79
§ 2. Evidences of the Identity of Species 82
Organic Structure. — Physiology. — Psychology . . . .85
§ 8. Application of these Criteria to Man 86
The Evidence Cumulative 88
§ 4. Philological and Moral Argument , 88
Brotherhood of Man • • . 90