xvi Illustrations. 



DIAGRAM ILLUSTRATING THE EVOLUTION OF THE 



HORSE 62 



THE PATAGONIAN CAW From Brehm 's "Natural 



History" 74 



THE CAPYBARA From Brehm's " Natural History " 76 



DARWIN SHOOTING AT A CONDOR . ... 78 



CAPE FROWARD, STRAITS OF MAGELLAN From 



Spry's " Voyage of the Challenger " . . .So 



MUD VOLCANOES, TURBACO, SOUTH AMERICA From 



Figuier's " World before the Deluge '' . .90 

 BARK-GATHERERS' CAMP IN PERU From Figuier's 



" Vegetable World" ro 2 



ELEPHANT TORTOISE, GALAPAGOS ISLANDS From 



Brehm's" Natural History" . . . .106 



DARWIN TESTING THE SPEED OF AN ELEPHANT 



TORTOISE (GALAPAGOS ISLANDS) . . . 108 

 A CORAL ISLAND, OR ATOLL From Figuier s " Ocean 



World" 112 



BIRGOS, OR COCOA-NUT CRAB 114 



DARWIN'S STUDY From " The Century Magazine " 1 28 



PORTRAIT OF CHARLES DARWIN From " The Cen- 



tury Magazine" . . . . . 1 5 



COLLECTING IN THE SARGASSO SEA . . . .176 



