Chapter III.--_Respiration of the Pupa._--Spiracles of Pupæ--Anecdote from De Geer--Air-Cell under Water--Difficulty of the task--Pupæ with an Air-tube 239 Chapter IV.--_Varieties and Age of the Pupa._--Different kinds of Pupæ--Age of the Pupa--Pupæ hatched in a Hot-house--Butterflies in Winter--Pupæ hatched by a Hen--Glass Eggs--Influence of Warmth and Cold--Dreams of Immortality--Réaumur's mistake--Varnishing Pupæ--Preservation of Eggs--Falling of the "Manna"--Final changes of the Pupa 251 Chapter V.--_The Great Change._--An Insect Prisoner--Escape of the Cossus--Escape of a Fly--A guide-line to the Captive--Cocoon of Emperor Moth--Escape backwards--Chemical solvent--Escape of Ants--Huber's Ant-hill--Assistant Ants--Aquatic Insects--The Caddis-worm--Singular escape--The Gnat--A time of Peril--Blood-Worms--A curious spectacle--The Dragon-Fly--Phenomena of the Change--The Insect new-horn--Curious facts about Pupæ 273 PART IV.--THE IMAGO. Chapter I.--_The New-born Perfect Insect._--The Resurrection--Meaning of the word Imago--Curious aspect of New-born Insect--Conclusion of the Dragon-Fly's History--Structure of a Wing--how expanded--Deformed Wings--Exception in the Ephemeræ--Dance of the Ephemeræ--Insects without Wings--Showers and Stains of Blood--Aphis-Lion Fly--Insects in the Imago state do not increase in size 309 Chapter II.--_The Structure and Organs of the Imago._--Anatomy and Physiology--Insects have not Bones--Leather-coated Jack--The Head and Thorax--The Eyes--simple and compound--Wonders of an Eye--Anatomy of the Eye--Immense number of Eyes--Remarkable Provision--Experiments on the Eyes of Bees--Beauty of the Eyes--The _Antennæ_--their Function, perhaps the Nose--Insects Weather-wise--Insects in Rain--Organs of Speech--Anecdote of Bees--Various Functions of Antennæ--The Mouth in Insects--Parts of the Mouth--Spiral Tube of the Butterfly--Taste and Smell in Insects--The Trunk--Wings--Membranous--Scale covered--Wing-Cases--Experiments on Flying--Painted Wings--The glory of the Butterfly--The Legs of Insects--Cleanliness of Insects--The Water Boatman--Kangaroo Beetle--The Abdomen--The Sting of the Bee--Insect with a Leg in its Tail 335 Chapter III.--_Respiration of the Imago._--Experiments upon the Breathing of Insects--Chloroform--Coal-gas--their Effects--Contest between a Spider and a Blue-Bottle Fly--Air-Pipes of Insects--Multitude of Air-Tubes-- Circulation of Blood in Insects--An Insect's Pulse 398