LIST OF ILLUSTRATIONS 



SURFACE SALINITIES OF THE OCEANS - frontispiece 



FIG. 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 2O 



4. ABYSSAL FISH (MACRURUS AND LYCODES) 32 



5. BOTTOM AND PELAGIC DIATOMS 40 



6. DIAGRAM SHOWING GRADUAL DISAPPEARANCE OF CALCIUM 



CARBONATE WITH INCREASING DEPTH - 41 



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) 6l 



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 IO3 



17. A TROCHOID WAVE - - Io6 



1 8. THE ADVANCE .OF A WAVE - - 107 

 iga. ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES 112 

 \<)b. ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES - 112 

 1% ILLUSTRATING THE EQUILIBRIUM THEORY OF THE TIDES 113 

 l<)d. ILLUSTRATING THE DIRECTION AND STRENGTH OF TIDE-PRO- 

 DUCING FORCES DUE TO THE MOON (G. H. DARWIN)- - 114 



ix 



