SEA-WEEDS. 



101 



on some parts of the coast of Scotland as the Sea- 

 whistles, because boys make bladders of its large 

 air-vessels. If these are thrown into the fire, they 

 burst with a loud report. 



One more Fucus only is very, common on our 

 shores. This is the smallest species, and called the 

 Channelled Fucus (Fucus canaliculatus) , from its 



channelled stems and branches. It has no air- 

 vessels, for it does not need them, as it grows on 

 the rocks, above the high-water mark, and on 



