

CONTENTS 



PACK 



Essay I. The Lesson of Evolution .... 1 



The growth of Natural Philosophy ... 3 



An outline of evolution . . . . . 10 



Inorganic evolution . . . . . 11 



Organic evolution . . . . . 18 



Design in Nature ..... 21 



Secondary Causes ..... 30 



Effects of the new teaching .... 35 



The purpose of evolution . . . . 37 



Summary ....... 43 



Essay II. The Progress of Life . . . . 47 



Early life on the Earth . . . . . 47 



The Laurentian Period .... 50 



Huronian Life . . . . . 53 



Algonkian Life ..... 55 



Cambrian Life . . . . . 57 



Speculations on pre-Ordovician Life . . 59 



Ordovician and Silurian Life . . . 63 



Speculations on Ordovician and Silurian Life . 67 



Summary . . . . . . 7] 



