THE FRESH-WATER AQUARIUM. 11 
for tanks. For elegance and general utility, a properly 
built vessel of rectangular outline, having at least two sides 
of glass, is found by most aquarians to be the best. Of 
course, no rule can be laid down as to the dimensions or 
VALLISNERIA SPIRALIS, ANACHARIS ALSINASTRUM—GOLD 
CARP, ROACH, AND MINNOW. 
forms of tanks—those details will best be determined by 
the means and tastes of the persons requiring them—but 
a few general remarks may prove useful. 
The tanks in use at the Regent’s Park Gardens were 
