lii CONTENTS, 



PACK 



8. Cause of waves — Their height — Thickness of the mass of 

 water in motion — Ground-swells — " Raz de Mare'e" — 

 Waves of translation — Measure of a wave of translation, 

 and of its speed, in the Pacific Ocean — Tides — Resume 74 



DEPOSITS IN COURSE OF FORMATION AT THE BOTTOMS 



OF SEAS. 



1. Universality of the process of sedimentation — General view 



of the mechanism of this phenomenon . . . .80 



2. Action of waves upon the coasts — Destruction of rock- 



bound shores by the sea — Pierced rocks — Silting-up of 

 shallow waters by marine alluvium . . . . b9 



3. Deposits in mid-ocean, and deposits on the coasts — Im- 



portance to geologists of coast-deposits as data for fixing 

 the limits of ancient seas — Deposits of the French 

 seas ......... 94 



4. Transport and deposit of rocks by floating ice . . . 99 



5. Water-springs in the earth — Fimnels or wells of the Jura 



— The Aveii of the South of France — Katavotron — Sink- 

 holes — Geysers — Submarine springs — Origin of oolitic 

 formations .102 



SUBMARINE LIFE. 



1. Exuberance of life in the depths of the ocean — Tableau- of 



the tropical seas — Life in the seas of the temperate 

 and the frozen spues — Natural illumination of the 

 oceanic abysses . . . . . . . 1 09 



2. Migration of marine animals — Nests at the bottom of the 



sea — Fisheries 124 



3. Terrible conflicts of marine monsters — Massacre of the weak 



by the strong ... .... 142 



4. Animated forests — Animal stones 161 



5. Sponges ......... 165 



6. Polypi — Their general structure — ^Reproduction of polypi — 



Vegetative life of polypi — The polypier— Two great 

 classes of polypi distinguished by the form of the 

 polypier — The Tubipora musica 170 



