The Aquarium 5 



and are then a total loss to their owners. 

 To reduce this danger to a minimum, they 

 should be placed on a very heavy piece of 

 felt, or on a thin soft cushion, and in such 

 a position that sudden changes of tem- 



J£SHS 



W fPll 



Fig. 3. Oblong glass aquarium. 



perature are avoided. This will secure an 

 even support for the often unevenly dis- 

 tributed weight and pressure on the bottom 

 of the glass and will add very considerably 

 to the durability of the vessel. 



Decidedly the best aquariums, however, 

 are those made of a good strong iron 



