1^7 



Radioactive substances in rain water: 153 



Stream silting: 13*+ 



Underground ■vra.ter detection: 83 

 r^ARDJE BIOLOGY: lo7 

 ^lARnffi I4AMIvlALS 



Grampus : 201 



Greenland : 79 



Novaya Zemlya: 9 



Narwal : ^6 



Phocinae: kl 



Seals: kl, 79 



Walrus: I52 

 MARINE PLANTS 



Algae: 97, I83, l8i+, I85, 202 



Phophyra: I83, I85 

 MOLLUSKS 



Caphalopods : kO 



Cultured oysters: 106 



Diseases: 93 



Optic centers: kO 



Oyster hepatitis: 129 



0;>'-ster purification: l6h 



Retina: 40 



Sterilizing lamps: 10^4- 

 OGEAWOGRAPHY 



Antarctic: I6, 127 



Arctic: 19, 36, 37, 38, 88, 100, II6, I31, 136, 157, 170, 171, 

 173, 180, 188, 189, 193, 19^, 20it, 205 



Azov Sea: 67 



Bathyscaphe: 22, 23, 9^, IO5, lk&, 155, 15^ 



Black Sea: 87 



Boron : 2k 



Bottom fauna: I8 



Bottom formation and echo- sounding: 139 



Circulation: 19 



Currents: II5, I36, 19^ 



32 



