188 GOLDFISH VARIETIES AND 
mon in all the Eastern States, growing in damp places, usually near or 
bordering streams. Considering that it is scarcely even a bog plant it 
does remarkably well in the aquarium, where it grows straight up to the 
surface of the water, regardless of where the light comes from. It is a 
fair oxygenator, but if kept submerged the leaves gradually dwindle 
in size, so that it is best to gather a new stock once a year, August or 
September being the best season to secure vigorous plants. 
QUILLWORT 
Isoetes is a widely distributed genus of a number of species. It is 
found in the mud and sand at the edges of streams and ponds. In size it 
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Fic. 138. Quittwort (Reduced one-half) 
varies from a few inches to several feet. The small submerged species 
are worth trying in the aquarium, as they are tenacious of life. The 
leaves rise from the centre of a circle or rosette, producing a very pretty 
effect. Quillwort should be placed in a good light. It is eaten by some 
snails and fishes. : 
