CHAPTER II.

TRANSFER, MODIFICATION, AND EXTIRPATION OF VEGETABLE AND OF ANIMAL SPECIES.

Modern Geography embraces Organic Life--Transfer of Vegetable Life--Foreign Plants grown in the United States--American Plants grown in Europe--Modes of Introduction of Foreign Plants--Vegetables, how affected by transfer to Foreign Soils--Extirpation of Vegetables--Origin of Domestic Plants-- Organic Life as a Geological and Geographical Agency--Origin and Transfer of Domestic Animals--Extirpation of Animals-- Numbers of Birds in the United States--Birds as Sowers and Consumers of Seeds, and as Destroyers of Insects--Diminution and Extirpation of Birds--Introduction of Birds--Utility of Insects and Worms--Introduction of Insects--Destruction of Insects--Reptiles--Destruction of Fish--Introduction and Breeding of Fish--Extirpation of Aquatic Animals--Minute Organisms, 57