EXviil CONTENTS. 
Page 
Luminous Insecrs—continued. 
Other Luminous Beetles - - - - - - 506 
Lantern-flies - - = = S $ ~ - 508 
Other Luminous insects - - - é - - 510 
Source of their luminous property - - ” - - 512 
Its remote cause - - - ~ - - - 513 
Its use - - = « = ‘si , - 514 
LETTER XXVI. 
Hyeernation oF Insects - - - - - §16—534 
In the egg state - = =. ms ‘ a = BLT 
pupa state - - - - s ie 8 - 518 
larva state - ” . 5 = = - 518 
perfect state = - : - - . . - 519 
Time of bybernation - - = e * a - 520 
Site of Hybernacula  - = . = = im - 520 
Solitary and social hybernation - - - - - 521 
Hybernation in several states - - - - - - 521 
Torpidity produced by cold - - - - - - 521 
Variations of torpidity - - - - - = 522 
Some inseets never torpid - - - - - - 523 
State of the Hive Bee in winter - - - 524 
Power of resisting cold by insects in different states - - - 526 
Cause of this power - ce - - - r 528 
Resumption of activity - - - - - = 529 
Cause of hybernation = = = = *. - 530 
LETTER XXVIII. 
Instinct or INsrers - - - - - - 585—567 
Nature of instinct - - - - - - - 585 
Definition of instinct - - = = a 5 Ee sti 
Exquisiteness of the instinets of Insects - - - - 538 
Variations of instinct - - - - - ~ 589 
Variations of instinct in the Hice Bev - - - - 542 
These variations not the result of reason - - - - 549 
Number of instinets in Inseets - - - - 550 
Extraordinary development of instinct in Inseets - - - 556 
Reason in Insects - - - - - o ~ 557 
Insects gain knowledge from experience - - - = 562 
receive and communicate information - =. “ - 564 
are endowed with memory - - - - - 565 
APPENDIX - - - - - - . - 569 
