68 



FEESH-WATEB AQUABIA. 



Mare's-tail is rather common, especially in the ditches of 

 Lincolnshire. It is a ready producer of oxygen, and should 

 be obtained as yoimg as possible. 



Fig. 49. Spiked Water Milfoil (Myriophyllum spicatum). 



The Spiked Water Milfoil {Myriophyllwm spicattmi) (Pig- 

 49) has long been a favourite with keepers of aquaria. It is 

 common in stagnant water, where it is entirely submerged 

 with the exception of the flowers, which rise a few inches 



