PLANTS SUITABLE FOR VIVARIA. 37 
a small pond with a sloping side. In this Vivarium the following 
plants may be successfully grown: The Frog-Bit (Zydrocharis 
morsus-rance, Fig. 24), this must float on the surface of the 
water; the Water-Soldier (Stratites aloides, Fig 25), in or on 
FIG. 25.—WATER SOLDIER (Stratiotes aloides), 
the water; the Vernal Water Starwort (Callitriche).verna, 
Fig, 26); the Water Crowfoot (Ranunculus aquatilis, Fig, 27); 
Ivy-leaved Crow-foot (Ranunculus hederaceus); the Buck-bean 
