LIFE BENEATH THE WATERS. 



CHAPTER I. 



THE PRINCIPLES OK THE AQUARIUM. 



The Principles of the Aquarium not a New Discovery — Mr. Warrington, Inventor of 

 the Aquarium — Tanks of the Zoological Society of London— Practice necessary in 

 the Management of Aquaria — Fish-globes— Animals inhale Oxygen and exhale 

 Carbonic Acid Gas — The " Black-hole " of Calcutta— Use of Plants in Nature— Use 

 of Snails in an Aquarium. 



The principles on which the Aquarium, or, as sonic writers 

 have called it, the Aqun-vii-ariuin, is founded, are not of 

 recent discovery ; on the contrary, they have been known 

 for some time — but it is, undoubtedly, to Mr. Robert AYar- 

 rington that we owe most of the practical knowledge that 

 is now found to be so useful to amateurs in the manage- 

 ment of these beautiful parlor ornaments. Mr. P. II. Gosse 

 has, also, contributed vast quantities of valuable information 

 in his books which amuse, and, at the same time, instruct 

 the reader. These two gentlemen, together with Messrs. 

 ; llibberd, Lankester and also a host of minor workers in 

 I this field of knowledge, have opened to the student of natu- 



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