The Aquarium 3 



it is undoubtedly cruel to place them there, 

 as the amount of water contained in the 

 average globe is not sufficient to sustain the 

 fish and to supply the oxygen necessary for 

 their life. In such a vessel a very frequent 

 renewal of the water is indispensable to the 

 life of the fish, and this is, in itself, a great 

 detriment, since it disturbs and irritates 

 even the most hardy inmates of this very 

 poor substitute for the aquarium. Another 

 great disadvantage of the globe is the dis- 

 torted picture it gives of its contents, when 

 they are observed sideways through the 

 glass. A further reason why the globe 

 should be avoided is the narrow top, which 

 greatly reduces the water surface exposed 

 to the atmosphere. On the other hand 

 globes of larger size are so fragile, their 

 walls being hardly thicker than paper, that 

 even a slight knock may break them. 



Large cylindrical glass vessels in one 

 piece may be arranged in a practical and 

 attractive manner, but if compared with 



