4-6 Fresh Water Aquarium 



erally known, but deserves the highest rec- 

 ommendation. In this case, too, the growth 

 should be watched, as it may encroach upon 

 its less vigorous neighbors. 



Narrow-leaved Waterweed (Elodca atlgUSti- 

 folia) is a native variety of great beauty 

 and hardiness. The thin stems are densely 

 covered with narrow, pointed leaves, dark 

 green on the older, but bright light green on 

 the new growth. The plant shows consid- 

 erable variation, which may be caused by 

 habitat or season, or possibly by both. We 

 have found the leaves strongly curled, so 

 that we were tempted to regard the plant 

 as an undescribed species; but careful com- 

 parison with specimens from different lo- 

 calities proved to us that our plant was 

 Elodea angustifolia. It is a very desirable 

 aquarium plant, comparing favorably with 

 other species. 



Tape-grass (J^alisneria spiralis). This is a 

 most valuable aquarium plant, and an easy 

 and free grower. The bright green grass- 



