x Illustrations 



FACING 

 PAGE 



iiwoRM ... 72 



Photo: J. J. Ward. 11- 



GLASS MODEL or A SBA-AXKMOXK 72 



Reproduced frm the Smithsonian Report, 1917. 



, M10US THK KvOLfTION OF THE BRAIN FROM FlSH TO 



73 



OKAPI AND GIRAFFE (Coloured Illustration) 74- 



I)IAGRAM OF A SIMPLE REFLEX ARC IN A BACKBONELESS ANIMAL LIKE 



ORM .... ... .76 



THE Vi rt A MOTH 76 



Photo: British Museum (Natural History). 



. MMAL BEHAVIOUR . ... 76 



FLY-TRAP .77 



Photo: J. J. Ward, F.E.S. 



A SPIDER Srxxixo HER EGGS ........ 77 



Reproduced by permission from The Wonders of Instinct by J. H. 

 Fabrr. 



I'm HOATZIX INHABITS BRITISH GUIANA ...... 82 



PERU- ITOI ........... 83 



Photograph, from the British Museum (Natural History), of a drawing 

 by Mr. K. Wilson. 



ROCK K \\.-.\itoo CAKHYING ITS YOUNG IN A POUCH .... 83 

 Photo: W. S IVrridpc, F.Z.S. 



PROFESSOR THOMAS HKXRV HUXLEY (1825-95) 86 



Photo: Risrhpit/.. 



BARON CUVIER, 1769-1832 gfj 



AM Il-I-l -THATION SlIOUING VARIOUS METHODS OF FLYING AND 



SWOOPING .......... 87 



ANIMALS or THE CAMBRIAN PERIOD ...... 90 



Prom Knipe's Xrhula to Man. 



A TRILOBITK 90 



Pbotoi J. J. Ward, F.E.S. 



TMB GAMBIAN MID FISH, PROTOPTERUS 91 



Ptioto: Britlkh Museum (Natural History). 



TMK ARCHAOPTERYX 9J 



After WillUm Leche of Stockholm. 



