ILLUSTRATIONS 





THE RESULTS OF EROSION BY RUNNING WATER . . . Frontispiect 



EDMUND HALLEY Facing p- 6 



HERSCHEL AND HIS SISTER AT THE TELESCOPE ..." 24 



PIERRE SIMON DE LAPLACE 34 



FRIEDRICH WILHELM BESSEL " 42 



HEIN'RICH WILHELM MATTHIAS OLBERS " 52 



LORD ROSSE'S TELESCOPE " 68 



WILLIAM SMITH " 76 



BARON DE CUVIER " 80 



THE EVOLUTION OF A HORSE'S FOOT AND OF A HORSE'S 



HEAD " 108 



JAMES HUTTON " 118 



A LANDSCAPE AND MAMMAL OF THE TERTIARY AGE . " 130 

 A LANDSCAPE AND TERRESTRIAL REPTILE OF THE MESO- 



ZOIC TIME " 142 



JAMES DWIGHT DANA . . . 



LOUIS JEAN RODOLPH AGASSI? 



148 

 CHARLES LYELL , 



ADAM SEDGWICK 



R-SPOUTS IN MID-ATLANTIC " 154 



!ATTAN ISLAND IN THE QUATERNARY AGE THB 



MASTODON " 164 



ALEXANDER VON HUMBOLDT " 196 



fac 



