The Aquarium 7 



whereas, wherever the untinned frame comes 

 in contact with the water, it soon becomes 

 covered with rust. This rusting causes a 

 loosening of the cement and a consequent 

 leaking of the aquarium, so that within a 

 short time it becomes unfit for use. Even 

 the outside enamel lasts longer on a tinned 

 than on an ordinary frame, on which it also 

 is speedily destroyed by the rust, against 

 which it but imperfectly and temporarily 

 protects the metal. It is therefore to the in- 

 terest of the buyer to see that all metal parts 

 of the aquarium are tinned, the more so as 

 the difference in price between those tinned 

 and those untinned is merely nominal. 

 Highly ornamental and durable, but rather 

 expensive, is the aquarium with all metal 

 parts nickel-plated, and with a glass, slate, 

 or marble bottom. It possesses all the good 

 qualities of the aquarium with the tinned 

 frame with the addition of greater beauty. 

 The oblong aquarium with a metal frame 

 is the most popular shape of this construe- 



