222 LAKES AND RIVERS, 



The time of the singing of birds has come, and insect 

 and plant-life begin rapidly to revive from the de- 

 pressing season of winter. The frogs spawn and the 

 tadpoles begin to develop. 



There is much to interest in the metamorphosis of 

 the frog if the spawn be kept in an aquarium and 

 watched. On the banks of our brooks we may in 

 March find the lungwort flowering, Pulmonaria offid- 



CADDIS-WORM IN ITS CASE. 



nalts; it is most common in Hampshire and Middlesex. 

 The trout and numerous little fish begin to be lively 

 in the water. The Mare's Tail (Hippuris vulgaris) 

 is now conspicuous along the banks of our marshy 



