12 



THE AQUARIUM. 



in. The floor of the tank should be covered with care- 

 fully washed gravel, and some rock-work should be so 

 arranged, by cementing, as to afford a small spot of dry 

 ground for such inhabitants as require it. Before tak- 

 ing leave of this part of our subject, we would observe 

 that where there is a fountain, the receptacle for the 

 overflow water should be as large as possible. 



