42 



NEW YORK AQUARIUM NATURE SERIES 



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IMPLEMENTS OF USE TO THE AQUARIST. 



1. Dipnet. 



2. Wooden forceps. 



3. Feeding- stick. 



4. Cleaning swab. 



fi. Glass tube for removing: refuse. 



The first indication of serious contamination is a slight 

 clouding of the water caused by the presence of countless mil- 

 lions of bacteria. This may go on until the water is of a milky 

 color and the balance of the aquarium is completely upset by the 

 accumulation of sulphur and ammonia compounds set free in the 



