OR, THE HOME-CULTURE OF FRESH-WATER PLANTS. 
the apparatus at the Cheltenham Meeting of the 
British Association, stated that “ visitors were 
so fond of blowing the bellows, that the curator 
found it quite unnecessary to employ attendants to 
inject fresh air into the tanks; 5 ’ an amusing remark 
which has been repeated by Dr. Lankester. 
A small hand-net is useful for occasionally re¬ 
moving fish or other animals; or, for more minute 
objects, a glass tube, to be used in the following 
manner :—If the thumb be placed tightly over the 
upper end of the tube, when about to be intro¬ 
duced into the water, and so held till its lower 
end is close to the object it is wished to take out, 
and then withdrawn, the water will rise into the 
tube itself, expelling a portion of the air, and the 
object may then be taken out along with the water 
in the tube. 
Experience, however, will best suggest many 
such contrivances necessary to the possessor of 
an Aquarium ; and as they will be of more value 
when arising in the course of such experience, than 
when derived from hints thrown out in this place, 
I shall leave the student to make his own disco¬ 
veries, in all mere matters of convenience; as he 
will necessarily adapt them more aptly to his own 
peculiar views and wants, than one who should 
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