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MUSEUMS. 83 
normal temperature, while three are capable (if so required) of being 
supplied with water of a warmth suitable for the reception of species 
from tropical latitudes. 
A very satisfactory system of aeration, by driving the air through 
rattan-canes conducted to the bottom of the water, instead of through 
metal pipes, has been instituted in the salt-water tanks. By this 
method (suggested by the Director and elaborated by Mr. Honiball, 
Lecturer on Engineering in the Technical Schools) the air, driven 
through the fine tubules of the cane, rises in extremely minute 
bubbles, and so oxygenates the water that it has been found possible 
to keep in excellent health for months many species of marine life 
which formerly could be kept alive for a day or two only. 
The efforts made to keep the tropical African Fishes in a healthy 
condition continue to be successful, and the great interest taken in 
them both by specialists and the ordinary visitor is marked. 
The Trout tanks continue in good condition. In order to 
introduce some new stock, a supply of eggs of the Loch Leven Trout 
was obtained, and the resulting fry are now thriving yearlings. As 
the fish from the various hatches increase in size, they become too 
large for the accommodation available and a number of specimens 
of Rainbow Trout are presented each year either to the Parks and 
Gardens Committee for distribution in the Park lakes, to the City 
_ Angling Association or to local pisciculturists. 
Captain Griffiths, of the Corporation Barge “‘ Beta,” continues to 
bring living specimens of Marine Fishes, and on the several 
occasions when the Assistant Curator has been out on the “ Beta” 
trawling for marine specimens for the British collections, the 
opportunity has been taken of bringing in suitable specimens alive 
for the tanks. 
The following species have been exhibited alive during the year, 
_ those with an asterisk being alive at the date of this report (new 
labels, with coloured drawings of the species living in the tanks 
have been affixed above certain tanks) :— 
Fresh Water Hydre* (Hydra viridis and H. fusca); Zoophytes 
(Antennularia ramosa, Hydractinia echinata); Sea-Anemones, The 
