CONTENTS. , XIU. 



Suicide of one — ^Holothurite — Chirodota — ^Its Structure — Its 

 Manners — Ovarian Threads — ^Effusion of Colour — ^The Leaf- 

 Worms — ^Their Elegance — Evolution of the Stomach — A new 

 Species — Structure of the Spears — Use of these Organs not 

 entirely known — Respiration — Reflections. 216 — 254 



CHAPTER XI. 



Practical Instructions — ^The Name — Vivarium — Aqua- vivarium^ — 

 Aquarium— The Tank.— Form and Size — Aspect — Cost— The 

 Preparation — Artificial Rocks, &c.— The Bottom — Water — • 

 The Stock — Plants — Animals — Procuring Specimens— Trans- 

 mission — General Directions — Purification — Occasional 

 Death— Instruments — Artificial Aeration — Evaporation — 

 Cleansing the Sides— Conclusion. 255 — 278 



