FEESli-WATEE AQUAKUM. :>1 



arc the sweet-scented water-lily (Nymphaa odcrata), and 

 the two yellow pond-lilies {Nuphar adrena and Kalmiana), 



and arc common in our larger ponds. They look orna- 

 mental when in bloom, but when not in flower, only fill 

 up the tank ; and, besides, require to be very deeply 

 rooted. They also die down in the winter, and, therefore, 

 arc objectionable in that season. 



The common* "Water-shield of our ponds (BrasenU 

 ■prftata) is allied to the lilies, and grows in the same 

 positions. The leaves float upon the surface of the water, 

 and are oval in form, with the stalk attached to the 

 centre of the under side. All the submerged portions of 

 this plant are covered with a gelatinous mucus that pre- 

 vents contact with the water. The process of opening of 

 the leaves is very curious in this plant, and worth watch- 

 ing. The flowers are small, and of a dull purple color. 



Some of the reeds and rushes, as the common Calamus 

 or sweet flag (Acorns calamus), may be introduced, but 

 require to be deep-rooted in the sand or soil of the tank ; 

 and even then will not be likely to flourish, though they 

 look well in a large collection while they live. 



It PLANTS PLACED ON KOCK-WOKK OUT OF THE WATER. 



On the rock-work can be grown the beautiful blue for- 

 get-me-not {Myosotis palustris), the Sun-dew (Droscm), of 

 which genus there are five species found in the United 

 States, and several other plants ; though I do not advo- 

 cate the use of any of those plants that are simply for 

 show, taking no part in the economy of the tank, and 



