Xll CONTENTS. 



CHAPTER XX.-THE NATURAL HISTORY OF THE 

 FLEA. 



Its supposed Manner of Appearance Its Eggs Rb'sel's 

 Opinion with respect to the Young Defrance's Opinion 

 The Manner of Preparing Food for the Young Larvas 

 Description of its Pupa and Cocoon Perfect Insect Its 

 Habits, 274 



CHAPTER XXI. THE NATURAL HISTORY OF VA- 

 RIOUS SPECIES OF CRABS AND OTHER CRUS- 

 TACEOUS ANIMALS. 



History of the Lobster The Mode of casting its Skin Its 

 Parasite History of the Land-crab History of the Her- 

 mit-crab History of the Pea-crab, 281 



CHAPTER XXII. ON THE METAMORPHOSES OF 

 INSECTS. 



Metamorphoses of Insects Larva Pupae Partial Com- 

 plete Semi-complete S ubsemi-complete Incomplete 

 Obtected Coarctate, 291 



CHAPTER XXIII.-HINTS FOR STUDENTS. 



Collection of Insects Charge of Cruelty considered Ad- 

 vantages of the Study of Entomology Number of Spe- 

 cies Means of obtaining a Knowledge of Forms and 

 Classification Number of Generic Divisions Terms 

 Instruments for collecting Easiest Modes of putting to 

 Death, &c. Localities of Insects Store-boxes, . . . 298 



