LIFE IN THE GREAT DEPTHS loi 



former are merely large, strong nets attached 

 to a stout, iron frame formed like runners 

 (Fig. i) and which are dragged slowly along 

 at the bottom of the sea. The dredges used 



INSTRUMENTS FOR COLLECTING DEEP SEA LIFE 



are fine-meshed nets, or bags, of stout twine 

 attached to a steel or iron frame with flaring 

 scrapers and protected by a bottomless bag 

 of stout canvas (Fig. 2). Although both the 

 dredge and the trawl are used by dragging 

 them along the bottom of the sea, yet each has 

 its special purpose and is employed under 



