28 NEW YORK AQUARIUM NATURE SERIES 



Dense Waterweed (Elodea densa). 



Narrow-leaved Waterweed (Elodea angustifolia) . 



Tapegrass (Valisneria spiralis). 



Waterviolet or Waterfeather (Hottonia palustris). 



Mudplant or Kidney-leaved Heteranthera (Heteranthera 

 reniformis) . 



Wavy-leaved Pondweed (Potamogeton crispus). 

 Dense Pondweed (Potamogeton densus). 

 Swimming Arrowhead (Sagittaria natans). 

 Narrow-leaved False Loosestrife (Ludwigia linearis). 

 Water-aloe, Water shears (Stratiotes aloides). 

 Swimming Arrow wort (Sagittaria natans). 

 The Creeping Rush (Juncus repens) . 



Water Milfoil or Thousand-leaf (Myriophyllum heterophyl- 

 lum). 



FREE SWIMMING PLANTS. 



Common Bladderwort (Utricularia vulgaris). 

 Southern Bladderwort (Utricularia americana). 

 Frogbite (Hydrocharis morsus-ranae) . 

 Small Duckweed (Lemna minor). 

 Three-leaved Duckweed (Lemna trisulca). 

 Floating Salvinia (Salvinia natans). 

 Moss-fern (Salvinia auriculata). 

 Floating Riccia (Riccia fluitans). 

 W^ater Hyacinth (Eichornia crassipes). 



STOCKING THE AQUARIUM. 



The experienced aquarist will naturally know what he 

 wishes and how to secure it. The beginner should start as sim- 

 ply as possible with only the commoner and hardier fishes and 

 wait until he has proved successful with these before attempting 

 to handle rare or expensive stock. Carps and the ordinary gold- 

 fishes known as "commons" are undoubtedly the best for the be- 

 ginner who is within easy reach of a dealer. The highly bred, 

 fancy varieties of goldfishes are less hardy and the same is gen- 

 erally true of exotic fishes, however attractive they may be. 



Almost any of the native fishes may be easily kept and will 

 prove interesting and attractive. Catfishes are perhaps the most 

 hardy, but the various suckers and many of the minnows, as well 



