LIST OF ILLUSTRATIONS 



SURFACE SALINITIES OF THE OCEANS 



frontispiece 



•''^- PAGE 



1. THE LAND AND WATER HEMISPHERES - - - - 6 



2. HYPSOGRAPHICAL CURVE OF THE EARTH'S SURFACE - - l6 



3. THE BRITISH ISLES AND THE CONTINENTAL SHELF - - 20 



4. ABYSSAL FISH (MACRURUS AND LYCODES) - - "32 



5. BOTTOM AND PELAGIC DIATOMS - - - - - 40 



6. DIAGRAM SHOWING GRADUAL DISAPPEARANCE OF CALCIUM 



CARBONATE WITH INCREASING DEPTH - - - - 4I 



7. CHART SHOWING LINES OF OBSERVATION PROPOSED FOR 



HYDROGRAPHIC WORK BY INTERNATIONAL FISHERY COUNCIL 56 



8. HYDROGRAPHIC OBSERVATION STATIONS IN THE IRISH SEA 



(1909) 59 



9. SURFACE CHART : NORTH ATLANTIC (AUGUST, 1896) - - 61 



10. DIRECTION OF CURRENTS IN THE IRISH SEA WHEN THE GULF 



STREAM DRIFT IS AT ITS MAXIMUM - - - -63 



11. IRISH SEA SURFACE TEMPERATURES (FEBRUARY) - - 64 



12. IRISH SEA SURFACE TEMPERATURES (AUGUST) - - - 65 



13. IRISH SEA : MIGRATION OF MARKED PLAICE AND ITS RELATION 



TO WATER-TEMPERATURE - - - ■ - - 66 



14. NORTH ATLANTIC ICEBERGS : PHENOMENAL DRIFTS - - 89 



15. SOUTH POLAR ICE LIMITS - - - - - "91 



16. THE PETTERSSON-NANSEN WATER-BOTTLE - - - 103. 



17. A TROCHOID WAVE - - - - " - - I06 



18. THE ADVANCE OF A WAVE - - - - - - I07 



19a. ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES - 112 



\^b. ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES - 112 



19^. ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES - II 3 

 19^. ILLUSTRATING THE DIRECTION AND STRENGTH OF TIDE-PRO- 



DUCING FORCES DUE TO THE MOON (G. H. DARWIN)- - II4 



ix 



