HALF AN HOUR WITH SEAWEEDS. 37 



persuade youngsters to place such bladdered sea- 

 weeds on the fire, telling them some tale or another 

 to encourage them to do so ; but well aware of the 

 volleys of explosions that will occur if their advice 



Fig. 7. 



Black Tang, or Bladder-wrack (Fucus vesiculosus). 



be carried out. The tips of the fronds or " branches " 

 of these " wracks " will sometimes appear swollen, 

 and covered with little tubercles scarcely raised 

 above the surface. These contain the arrangement 

 for the fructification of the plant, which is exceed- 



