LIST OF PLATES ix 



FACING PAGE 



THE SEED OF THE ELM IS SURROUNDED BY A WING-LIKE 



EXPANSION ........ 58 



THE SEED CASES OF THE MARTYNIA 60 



PATCHES OF SPORANGIA ON BACK OF MALE FERN . . 64 

 THE NORMAL DEVELOPMENT OF A BEAN . . . .64 



SOME SPECIES OF IRIS HAVE AN UNPLEASANT SMELL WHICH 



IS ATTRACTIVE TO CERTAIN INSECTS ..../ 



SIDE VIEW OF THE FLOWER OF ARISTOLOCHIA GlGAS, SHOW- 

 ING THE TORTUOUS PASSAGE IN WHICH THE FLIES ARE 



ENTRAPPED 72 



THE NECTARIES OF THE CUCKOO FLOWERS ARE AT THE BASE 



OF THE TWO SHORT STAMENS ..... 78 



WHILST THOSE OF THE BUTTERCUP ARE AT THE BOTTOM 



OF THE PETALS 78 



THE POLLEN MASSES MAY BE REMOVED FROM THE FLOWER 



OF THE PURPLE ORCHIS ON THE POINT OF A PENCIL 78 



POINSETTIA PULCHERRIMA, FROM SOUTH AMERICA . . 80 



PASSION FLOWERS ARE LARGELY FERTILISED BY HUMMING- 

 BIRDS ......... 8O 



A WELL-PROTECTED CACTUS ...... 86 



CACTUS THORN 90 



NETTLE STINGS (magnified) 90 



THE BROOKLIME AND THE MINT 92 



INK-BOTTLE OR URN-SHAPED FLOWER OF THE WHORTLE- 

 BERRY, SPECIALLY DESIGNED TO EXCLUDE CREEPING 



INSECTS ......... 96 



HAIRS ON FOXGLOVE'S LIP TO EXCLUDE UNWANTED VISITORS 98 



THE SENSITIVE PLANT ....... 106 



THE SENSITIVE PLANT AFTER CONTACT . . . .106 



VENUS FLY-TRAP, SHUT 112 



