PREFACE, 



In the Introductory Chapter of this little Work will be 

 found some general observations on the nature and uses of 

 the Aquarium. These are accompanied by a few practical 

 hints for the guidance of those who wish to possess such 

 receptacles. The greater part of the volume, however, is 

 occupied by descriptive accounts of such animals as have 

 been, or may be, observed in Aquaria to greatest advantage. 

 They are arranged in the order of their respective classes ; 

 and while the greatest attention has been given to observa- 

 tions of their functions and habits, their physical structure 

 and the places they occupy in the system of Nature have 

 not been forgotten. 



The Writer^s personal observations of Hi/droid Zoophytes^ 



