A PRACTICAL JOURNAL OF 
HOME ARTS. 
Vol. in. NEW YOEK, JUNE, 1880. No. 6. 
striped dace {not Pigmy dace, eel, or gold 
Ush) of as nearly equal size as it is possi- 
ble to obtain. We have now got each 
vessel, as regards the size of the fish and 
the amount of water and light, exactly- 
alike. The dace in the glass jar for the 
first twenty-four hours will remain at the 
bottom ; during the next twenty-four hours 
he will have changed his position to the 
centre of the body of water contained in 
the jar, and in the next twenty-four hours 
he will be hugging as close as he can get 
to the surface of the water ; he will have 
lost his color, and will be gasping, weak, 
and tired. And in a few hours more he 
will be found dead at the bottom of the 
jar, or in the agony of suffocation he will 
have jumped out. 
We will now examine the dace in the 
wash basin. Oh, he looks splendid ! How 
active he is. How bright his colors ; and 
perhaps he will take a small piece of 
angle worm ; yes, he has taken it, and is 
looking for more— a sure sign of perfect 
health in a fish. How long will he live in 
that water without its being changed ? A 
week, unless the atmospheric temperature 
increases. 
Now what does this go to prove ? First, 
that in aquaria, or vessels made for con- 
Management and Selection of Aquaria. 
II. 
BY A. W. ROBERTS. 
N a previous article 
w e studied experi- 
mentally the effect 
of light and heat on 
the vegetable spores 
and germs which 
are contained in al- 
most all water. We 
will again fill the jar 
up to the rim with 
fresh water, and 
then take a wash 
basin or any shallow 
vessel of earthen- 
ware or wood, and pour into it the same 
amount of water that is contained in the 
jar, seeing that the water in the shallow 
vessel is not less than three inches in 
depth. We will now place both vessels in 
a shady (not dark) position, where no di- 
rect sun rays ever reach them. Into each 
vessel we will place a small sun-fish or 
