CHAPTER II.

OF THE ARRANGEMENT OF THE MATERIALS WHICH COMPOSE THE CRUST OF THE EARTH.

SECTION I.--THE CLASSIFICATION OF ROCKS, 21

SECTION II.--THE PLUTONIC ROCKS, 23

SECTION III.--THE VOLCANIC ROCKS, 25

SECTION IV.--THE NON-FOSSILIFEROUS STRATIFIED (OR METAMORPHIC) ROCKS, 30

SECTION V.--THE FOSSILIFEROUS ROCKS, 32

SECTION VI.--FOSSILS, 57

SECTION VII.--THE TIME NECESSARY FOR THE FORMATION OF THE STRATIFIED ROCKS, 63