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THE FRESH WATER AQUARIUM. 
In summer time, if the tank should get accidentally 
heated, it may be quickly cooled by wrapping around it 
a coarse cloth saturated in water, and keeping it wet from 
time to time. These matters may be much simplified by 
fixing a small thermometer within the tank below the 
level of the water. 
Dead specimens must be removed as quickly as pos- 
sible, Biyalves are generally very hardy, but if death 
happens to one, the production of sulphuretted hydrogen 
is very rapid, and quickly fouls the tank. 
Disease of Fishes.—I have tried numerous remedies 
for the diseases which beset fishes in winter, but with very 
little success. When the caudal fin gets coated with a 
fungoid growth, I have at once cut it off by means of a 
pair of scissors, and it has usually grown again in a few 
weeks, I have a couple of minnows now, that were so 
operated on last winter, they are as hearty as ever, and 
their tails are quite renewed. Diseased animals should 
always be removed to a pan of fresh river water, and 
placed in a quiet cool place, where they will probably 
recover. 
