LIST OF FIGURES. 



INTRODUCTION. 



FIGURE VOL. I. PAGE 



A. TJrack of the " Blake " (U. S. C. S. 1 ). In pocket at end of Vol. I. 



B. Morro Light and Castle, Havana, with modern limestone terrace in 



foreground, from a photograph ....... xii 



C. Western Slope of St. Kitts, from a photograph xv 



D. Pitons of St. Lucia, from a photograph xvii 



E. Kingstown, St. Vincent, from a photograph . . . . . . xviii 



I. EQUIPMENT OF THE "BLAKE." (Figs. 1-33.) 



Frontispiece. U. S. Coast and Geodetic Survey Steamer " Blake " (U. S. C. S.). 



1. Brooke's detacher (Sigsbee) 3 



2. Sir William Thomson's sounding machine (Thomson) .... 4 



3. Sigsbee's sounding machine (Sigsbee) 6, 7 



4. Sigsbee's sounding machine, profile (Sigsbee) ...... 7 



5. Sigsbee's sounding machine, end view (Sigsbee) 8 



6. Sigsbee's detacher and Belknap sounding cylinder (Sigsbee) ... 10 



7. Section of Fig. 6 (Sigsbee) 10 



8. Belknap' s cylinder detached from shot (Sigsbee) . . . 10 



9. Comparative size of hemp and wire used for sounding (Sigsbee) . . 12 



10. Sounding lead with Stellwagen cup (Sigsbee) ...... 12 



11. Miller-Casella thermometer, \ 15 



12. Negretti-Zambra thermometer, Italian model ..... 16 



13. Siemens's sinker and resistance coil (Bartlett, U. S. C. S.) ... 17 



14. Wheatstone's Bridge (Bartlett, U. S. C. S.) 18 



15. Siemens's deep-sea thermometer (Bartlett, U. S. C. S.) .... 19 



16. Hilgard's salinometer (Sigsbee) 21 



17. Sigsbee's water cup (Sigsbee) ......... 23 



18. Section of Sigsbee's water cup (Sigsbee) ...... 23 



19. Mode of attachment of cups and thermometer (Sigsbee) .... 23 



20. Miller-Casella thermometer in protecting case, with Sigsbee's attach- 



ment (Sigsbee) 23 



21. O. F. Muller's dredge (Thomson) 24 



22. "Blake "dredge frame 24 



23. "Blake "dredge 24 



24. Bar and tangles 



25. " Blake " trawl (Sigsbee) 26, 27 



26. "Blake "trawl 26 



1 The authority from which the figure is derived is inserted in parentheses. U. S. C. S. = 



United States Coast Survey. 



