82 FEESH-WATEE AQTTAEIA. 



plants shoiald be chosen for the purpose ; such caji generally 

 be found growing very near a large one. They ought to be 

 taken with as much of their native soil clinging to their roots 

 as possible, and then planted in a convenient-sized pot con- 

 taining loam and gravel. 



The Common Arrow-head (Sagiitaria sagittifolia) (Fig. 61) is 



Fig. 61. Common Arrowhead (Sagittaria sagittifolia). 



very hardy, and will grow well in the aquarium. The arrow- 

 head-shaped leaves of this plant will easily lead to its recog- 

 nition. Its flowers have three white petals, and grow in whorls 

 on stalks which rise about 6in. above the water. This plant 

 sends out runners ending in tuberous roots. The Arrow-head is 

 rather common in lakes, ponds, and ditches, and is often found 

 in the company of the "Water Plantain. It should be placed m. 

 the tank accordiag to the directions given for the setting of the 

 latter plant. 



