34 PRINCIPLES OF THE AQUARIUM. 



the top, and has there attached to it a piece of long 

 indiarubber tubing. The cork and tubes should fit 

 perfectly. In order to set this easily improvised 



Fig. I. 



Extemporised Fountain for small Fresh-water or Marine Aquaria. 



fountain in action you fill the bottle. When it is full, 

 continue pouring water gently into the funnel until 

 it is above the level of the bend in the tube C. A 

 little will then flow over into the long leg of the 



