Part 6

The horizon 93

The cliffs 93

The waters, their divisions 93

The sea, always the same level 94

" waters poured into it 94

Rain, how produced 95

Rivers and streams 96

" causes of their overflowing 97

Lakes 97

Chalk downs, &c., once a sea bottom 98

Sea, its encroachments 98

" waves of 99

" Sargasso 101

Gulf stream 101

Sand, formation of 102

" none in deep seas 102

Diatomaceæ 103

Foraminiferæ 104

Salt, the source of 104

Sea-water, composition of 105

Tides 105

Waters, beneficially arranged 107

Steam navigation 108

Introduction to organic kingdoms 110

THE VEGETABLE KINGDOM.

Quantity, distribution, &c. 112

Forests of Russia and America 113

Sargasso sea, sea-weed 114