CONTENTS xiii 



PAGE 



Chapter 34: Seal Fisheries 716 



Fur Seals • In Southern Hemisphere • In Northern Hemisphere 



Natural History • Sealing Methods • Fur-Seal By-Products • Hair 



Seals • Sea Lions • Walrus • The Atlantic Walrus • The Pacific 

 Walrus • Method of Hunting. 



Chapter 35: Commercial Sponges 733 



History of the Industry • Decline in the Production of Sponges • Statis- 

 tical • The Living Sponge • Description of Commercial Sponges 

 Chemistry of Sponges • Sponge Culture • Commercial Varieties of Sponges 



Sheepswool or Wool Sponges • Yellow Sponges • Velvet Sponges 

 Grass Sponges • Glove Sponges • Wire Sponges • Reef Sponges 

 Hardhead Sponges • Turkey Cup or Turkey Solid Sponges • Tvirkey 

 Toilet Sponges • Zimocca Sponges • Honeycomb or Bath Sponges 

 Elephant-Ear Sponges • Methods of Fishery • Nude Diving • Hook- 

 ing and Harpooning • Machine Diving • Dredging or Trawling • Prep- 

 aration of Sponges for Market. 



Chapter 36: Some Problems of the Fisheries 752 



The Work of the Fish and Wildlife Service ■ Salting Problems • Utiliza- 

 tion of New Species • Utilization of Fish Livers • Fish Freezing Prob- 

 lems • Shellfish Freezing Problems • Utilization of Fish Waste • Fish- 

 ing Studies • Sponge Problems • Utilization of Algae • Problems of 

 International Significance • Knowledge of Resources of Ocean Needed 

 New Fishing Methods May be Needed • Handling and Distribution Prob- 

 lems • By-Product Problems • Utilization of Plankton. 



Index 767 



