Fish Goldfish 
out and poured back from the height of a foot or 
two, so as to become aerated. It is a good plan to 
have two globes, and so transfer the fish with the 
hands, or with a shallow dip-net from the one in 
which the water is stale, to the one containing fresh 
water; but the water in the two globes should be 
of nearly the same temperature. The globes should 
never be placed where they will receive sufficient 
direct sunlight to heat the temperature of the water 
appreciably. 
If a balanced aquarium is used, there will need to 
be some tadpoles introduced to keep down the 
growth of low vegetation. Frog tadpoles are especi- 
ally excellent for this purpose, since they remain in 
the tadpole stage for so long a period. There should 
be one tadpole for every two or three fish in the : 
aquarium. 
A north window gives the best light for the 
aquarium; it should stand at least six inches from 
the window, and a window shade should be used 
to regulate the light. Next to a north window 
an east window is best. In winter the aquarium 
should have all of the sunlight possible in our north- 
ern climate. 
Placing the aquarium in too much light causes a 
prolific growth of fine green slime, which is a low 
form of vegetation. This should be cleaned, at 
least once a week, from the sides of the aquarium 
by the use of a small sponge, or a cloth, fastened 
to the end of a stick. A large glass pipette or dip- 
tube should be used to remove any foul material 
settling on the bottom. Once or twice a year the 
balanced aquarium should be thoroughly cleaned. 
The rocks, pebbles, sand and shells should be well 
washed and scalded with salt water. The sides 
230 
