ILLUSTEATIONS 



Chart of the British Plateau and Norwegian Sea 



Frontispiece 



FIG. 



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8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 



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 31. 



The Lucas automatic sounding machine 

 The stop-cock sounding lead .... 



Deep-sea reversing thermometer, Kiel hydrometer 

 Nansen-Pettersson water-bottle 

 International Fishery Investigation area 

 Naturalist's dredge . 

 Beam trawl-net 

 Otter trawl-net 

 Arrangement of trawl gear 

 Agassiz trawl-net . 

 Sea-bottom fishing basket 

 Ordinary surface tow-net 

 Heligoland " Scherbrutnetz " 

 Sea- bottom deposits 

 Hydrographic section shewing temperature over the Wyville 

 Thompson Ridge ....... 



Similar section shewing salinities ..... 



Chart of North-Western Ocean shewing the Euroj^ean 



Stream and its offshoots 

 Plankton : fishes, worms, etc. 



Crustacea 



protozoa, etc, 



diatoms 



of fish ova in the plankton of Cardigan Bay 



Plankton : 

 Plankton : 

 Plankton : 

 Succession 



1905-6 



Rough succession of plankton in the sea off N.W. England 

 The vertical quantitative plankton net .... 



The Heusen " Filtrator " . " 



The Korbnetz ......... 



The " Stempel-pipette " 



Distribution of plankton in the North Atlantic 



summer ........ 



Distribution of plankton in the North Sea in January 



Variation of plankton and silicic acid in Kiel Bay 

 Forms of bacteria 



in the 



to face p. 

 , 1897 



to face p. 



PAfiE 



4 



6 



8 



9 

 15 

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 20 

 23 

 24 

 26 

 27 

 35 



39 



40 



47 

 68 

 71 

 76 

 79 



95 



96 

 122 

 125 

 127 

 133 



152 



156 

 237 

 256 



