The Algge 



247 



FIG. 147. Seaweeds on the rocky coast of Nova Scotia. 



of the potassium salts which are required in large quantities 

 for the manufacture of commercial fertilizers. The great kelp 

 beds of the Pacific coast are being harvested on a large scale 

 in order to secure these products. The kelps are dried and 

 burned, and the potassium and iodin are obtained from the 

 ashes. 



