158 



MARINE AQUARIA FOR ROOMS. 



hydrometer, however, is much easier to use, and is 

 altogether better. 



nr^y-^-i 



Self-acting Air-can for Aquatic Animals. 

 Fig. 115. 



Section of ditto. 



Undoubtedly one of the charms of marine aquaria 

 consists in the personal collection of the objects. 



