CONTENTS. 



Vll 



Cocco-viviparous flies {HippohoscidcB) 

 Effects of heat upon eggs .... 

 Management of silk- worms' eggs , 

 Eff"ects of light on eggs .... 



Some insect eggs increase in size . 

 Growth of the eggs of ants .... 

 Development of the eggs of spiders . 

 Spiders live long without food . . , 

 Insects probably gnaw through their egg-shells 

 Valves of insect eggs ..... 

 Period of hatching influenced by temperature 



SECTION II.— LARV^. 



Page 

 116 

 118 

 120 

 ib. 

 121 

 122 

 123 

 124 

 125 

 126 

 127 



CHAPTER VI. 



Structure of caterpillars, grubs, and maggots 128 



Meanings of these terms ..... Note, ib. 



Supposed transmutation of plants into animals . . . 129 



Observations of Un^'er upon this 130 



Remarks of Bory St. Vincent 131 



Supposed formative power of the blood .... 132 



Embryo butterfly in the caterpillar 133 



Experiments to show this 134 



Dissections of the buds of plants , . . . . .136 



Diff"erence of plants from insects ..... 137 



Internal structure of caterpillars 138 



Breathing-tubes and formation of their blood . . . 139 



Colours of caterpillars not intended for concealment . . 140 



Imitative forms of caterpillars 142 



Walking-leaf insect ........ 144 



Caterpillars in form of branches 145 



Conspicuously-coloured caterpillars ..... 147 



Butterflies supposed to be coloured like flowers . . . 149 



Singular forms of caterpillars 151 



Forms of water-grubs ....... 154 



Breathing-organs in water larvae 156 



Water-worms (iWfi.s) may be mistaken for larvae . . 159 



Syringe for respiratiota in a water larva .... 161 



Curious mask of the same larva . . , , . 163 



Dust mask of the wolf-bug (BedKUfMs) 165 



CHAPTER VII. 



Growth, moulting, strength, defence, and hybernation of larvae . 166 

 Progressive iucrease of the silk-worm . . . . .167 



Compared with the growth of buds ..... 168 



Process of moulting or casting the skin ..... 169 



Accidents interrupt this process 170 



Reds, a disorder similar lo renal gravel .... 172 



Position of the hairs in moulting 173 



Casting of the interior lining of the stomach, &c. . . . 174 



Moulting of birds 176 



Cast sivius sometimes devoured ...... 177 



Misstatement of Goldsmith ...... ib. 



Contrivances for escape from confinement .... 178 



Muscular strength of insects .....' 17^ 



