BITS BY POND, RIVER, AND SEASHORE. 181 



shore are barnacles. They cover stones and wood- 

 work and ironwork ; and when once thev have 



15ARNACLES AND PURPLE SHELLS OX ROCKS. 



established themselves, it is not long before shell 

 joins shell, and fresh settlers arrive to extend 

 the limits of the colony. Not unnaturally many 

 visitors to the seaside consider them to be 



