XU CONTENTS. 



CHAPTER XX.— THE NATURAL HISTORY OF THE 

 FLEA. 



Its supposed Manner of Appearance— Us Eggs—Rosel's 

 Opinion with respect to the Young — Defrance's Opinion 

 — The Manner of Preparing Food for the Young Larvae — 

 Description of its Pupa and Cocoon — Perfect Insect — Its 

 Habits, 274 



CHAPTER XXL— 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 XXn.— ON THE METAMORPHOSES OF 

 INSECTS. 



Metamorphoses of Insects— Larva — Pupae — Partial — Com- 

 plete — S emi-c omplete — S ubsemi-c omplete — 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, . . . 29& 



