Great Men and Their Environment

Solidarity of causes in the world, . The human mind abstracts in order to explain, . Different cycles of operation in Nature, . Darwin's distinction between causes that produce and causes that preserve a variation, . Physiological causes produce, the environment only adopts or preserves, great men, . When adopted they become social ferments, . Messrs. Spencer and Allen criticised, . Messrs. Wallace and Gryzanowski quoted, . The laws of history, . Mental evolution, . Analogy between original ideas and Darwin's accidental variations, . Criticism of Spencer's views, .