xii CONTENTS. 



CHAPTER VHI. 

 THE SENSES OF ANTS. 



PAOB 



SIGHT : Difficulty of understanding how insects see Number 

 of eyes Two theories Views of Miiller, Grenadier, 

 Lowne, Claparede Appreciation of colour Sensitiveness 

 to violet Perception of ultra-violet rays. HEABING : An- 

 tennae regarded by many entomologists as organs of hearing 

 Opinions as to whether ants, bees, and wasps hear 

 General opinion that bees and wasps can hear Huber and 

 Forel doubt in the case of ants Experiments with ants 

 Forel's observations Colonel Long Mr. Tait Structure of 

 anterior tibia. THE SENSE OP SMELL . . .182 



CHAPTER IX. 

 GENERAL INTELLIGENCE. 



Statements of previous writers Economy of labour Experi- 

 ments as to ingenuity in overcoming obstacles and econo- 

 mising labour Experiments with bridges, embankments, 

 and moats Earthworks Ingenuity in building nests 

 Difficulty in finding their way Experiments with movable 

 objects Sense of direction Experiments with rotating 

 disks Experiments with rotating table Influence of light 236 



CHAPTER X 

 BEES. 



Difficulty experienced by bees in finding their way Communi- 

 cation between bees Bees do not by any means always 

 summon one another when they have discovered a store of 

 food Bees in strange hives Infatuation of bees Want of 

 affection Behaviour to queen Sentinels The sense of 

 hearing The sense of colour Experiments with coloured 

 papers Power of distinguishing colours Preference for 

 blue Influence of bees on the colours of flowers Blue 

 flowers Paucity of blue flowers Blue flowera of compara- 

 tively recent origin . . . 274 



