GENERAL CONTENTS, 



PHYSICAL GEOLOGY. 



CHAPTER I. DEFINITION AND ORIGIN OF THE SCIENCE. 



Objects and origin of the science 

 Origin of inductive geology . 

 Basis of Werner's system . 



Inductive geology principally 



founded on organic remains . 5 



Progress of palaeontology in England 6 



William Smith .... 7 



CHAPTER II. MODERN VIEWS OF THE EARTH'S DENSITY, SHAPE, 

 STRUCTURE, AND ORIGIN. 



The figure of the earth . . 10 



The earth's solidity inferred . 1 1 

 Evidence of the spherical form of 



the earth . 12 



Earth's orbit influencing tempe- 

 rature of its surface . 



Speculations on the origin of the 

 earth 



Inferences from meteorites . 



CHAPTER III. THE CHIEF MINERALS WHICH FORM THE EARTH. 



Mineral substances which consti- 

 tute aqueous rocks . . .21 

 The family of felspars . . 22 



Augites and hornblendes . . 24 



Micas and talcs 



Garnets 



Zeolites 



25 

 26 



27 



CHAPTER IV. NATURE AND ORIGIN OF CRYSTALLINE AND IGNEOUS 



ROCKS. 



Foliation 31 



Cleavage 32 



Structure of granite 33 



Relations of crystalline rocks, &c. 35 



Quartz-orthoclase rocks . . 36 



Imperfectly crystallised granitic 



rocks 37 



Quartzless orthoclase rocks . . 38 



Quartz-bearing plagioclase rocks . 39 



Quartzless plagioclase rocks . . 40 



| Joint structure of igneous rocks . 42 



CHAPTER V. NATURE, COMPOSITION, AND ORIGIN OF WATER-FORMED 



ROCKS. 



Kinds of deposit 

 Sand . 

 Clay . 

 Selenite 

 Alum . 

 Septaria 

 Phosphatite . 



44 

 45 

 46 



46 

 46 



47 

 47 



Limestones .... 

 Simultaneous origin of water 



formed rocks 



Horizontal sequence of rocks 

 Vertical sequence of rocks . 

 Relation of deposits to land 

 Table of British strata . 



47 



49 

 5' 



52 

 54 

 55 



