Il6 SPONGES 



Economic Value. — Sponges have long been known as 

 articles of commerce. The valuable sponge is the one pos- 

 sessing the horny, fibrous frame-work and its value depends 

 upon its softness, fineness of fiber and size. They abound 

 in the tropical regions and the ones that are found in the 

 Mediterranean Sea are most highly prized. 



