DUCKWEED. 



45 



little girl ; " and when I have collected some more 

 I am to sleep upon it, and it will be just like a 

 pillow of down." 



Eobert wished to know what is the real use of 

 the silky tufts on the cotton-grass, and he was 

 told that they surround the seed, and are intended 

 to waft it to different places. 



" But before I proceed further," said his father, 

 " I must mention weeds that are very familiar to 

 you, as forming a dense green covering to ditches, 

 pools, and lakes. There are several species of 

 DUCKWEED, but two only are common in our 



LESSER DUCKWEED. 



ditches : perhaps the one best known to you is the 

 Lesser Duckweed,* the simplest of all flowering 

 plants." 



* Lemna minor. 



