xxviii CONTENTS. 



Page 



LUMINOUS INSECTS continued. 



Other Luminous Beetles - 506 



Lantern-flies - - - - - 508 



Other Luminous insects 



Source of their luminous property 



Its remote cause - 



Its use .,...- 



LETTER XXVI. 



HYBERNATION OF INSECTS - " 516 534 



In the egg state - - 



pupa state 



larva state - - - 518 



perfect state 



Time of hybernation - 



Site of Hybernacula ..." - - 520 



Solitary and social hybernation .... 



Hybernation in several states - - - 521 



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 - - 526 



Cause of this power 

 Resumption of activity 

 Cause of hybernation ... - 530 



LETTER XXVII. 



INSTINCT OF INSECTS - ... 535 567 



Nature of instinct - 



Definition of instinct - - 537 



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 - - - - - - -557 



Insects gain knowledge from experience - 562 



receive and communicate information - 



are endowed with memory ... - - 565 



APPENDIX ..._--- 569 



