86 



THE AQUATIC GARDEN. 



like those of the frog-bit. These are borne to the top 

 of the water when ready, in order to be properly fer- 

 tilised. As the plant is of slow growth, and tolerably 



Fig. 37- 



Water Soldier (Stratiotes aloides). 



hardy, it may advantageously be used for aquarium 

 purposes, although it is not of much service for 

 aerating the water. Another and a rarer British plant, 

 but one which is not uncommon in the sluggish rivers 

 of the east of England, is the bladder-wort (Utricu- 



