viii CONTENTS 



Essay II. continued FACE 



Later life on the Earth ..... 72 



Deutozoic Life . . . . . 75 



Mesozoic Life . . . . . 81 



Cainozoic Life . . . . 87 



Inferences and Speculations . . . . 93 



Table shewing the relative thickness of the Rocks in each 



Geological Period ...... 101 



