4 8 



FRESH-WATER AQUARIA. 



contaminated water. These symptoms are due to 

 want of air ; and when you perceive them, at once 

 remove the aquarium to where it will receive an extra 

 stimulancy from sunshine and oxygen. If this does 

 not immediately remedy the evil, 

 remove one or two of the fish or 

 newts, or other of the larger animals 

 to a temporary glass, such as is 

 shown in Fig. 8, where there are 

 plants of Vailisneria, &c., growing. 

 This is one of the best oxygen- 

 giving, fresh-water plants we have, 

 and may be used in small tempo- 

 '^ rary jars or glasses for the purpose 

 of so aerating the water that it 

 * acts as a restorative, and the glass 



Vallisneria is the best re- t h us ser ves as a kind of COnva- 

 storing plant. 



lescent hospital. If a large aqua- 

 rium is kept, or more than one, an infirmary of this 

 kind will be found very useful.* 



We repeat it, that the only successful way in which 

 aquatic animals and plants can be maintained in a 

 healthy condition, is by endeavouring as far as possible 

 to imitate natural conditions. This, however, presumes 



* It will be noted that all the foregoing directions apply only to 

 streamless fresh-water aquaria. When opportunity affords (as it often 

 may do) of constructing them so that the water may be conducted by a 

 pipe from the usual household supply, and a constant circulation and 

 aeration can be kept up, much labour will be saved, and the objects 

 will appear more healthy and active. 



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