CONTENTS. 



LujiiNOus Iksects — continued. 



Other Luminous Beetles 

 Lantern-flies - . - 



Other Luminous insects 

 Source of their luminous property- 

 Its remote cause 

 Its use . - _ 



Pago 



- 506 



- 508 



- 510 



- 512 



- 513 



- 514 



LETTER XX VL 



Hybernation of Insects 



In the egg state . - - - 



pupa state . ■ . . 

 larva state -. » 



perfect state - - - - 



Time of hybernation . . . - 



Site of Hybernacula - - - - 

 Solitary and social hybernation 



Hybernation in several states . - - 



Torpidity produced by cold . - - 



Variations of torpidity . _ . 



Some insects never torpid . - - 

 State of the Hive Bee in winter 

 Power of resisting cold by insects in different states 

 Cause of this power ... 



Resumption of activity . - - 



Cause of hybernation . . - 



516—534 



- 617 



- 518 



- 518 



- 519 



- 520 



- 520 



- 521 



- 521 



- 521 



- 522 



- 523 



- 524 



- 526 



- 528 



- 529 



- 530 



LETTER XXVIL 



Instinct of Insects 



Nature of instinct . . - - 



Definition of instinct .... 

 Exquisiteness of the instincts of Insects 

 Variations of instinct - . - - 



Variations of instinct in the Hive Bee 

 These variations not the result of reason 

 Number of instincts in Insects 

 Extraordinary development of instinct in Insects 

 Reason in Insects .... 



Insects gain knowledge from experience « 



receive and communicate information - 



are endowed with memory 



535— 5G7 



- 535 



- 537 



- 538 



- 539 



- 542 



- 549 



- 550 



- 556 



- 557 



- 562 



- 564 



- 565 



Appendix 



569 



