NARRATIVE OF THE CRUISE. 



XXI 



VI. WOODCUTS. 



First Part. 

 Figure 



H.M.S. Challenger, 



1. The Steam Pinnace in Sydney Harbour, 



2. Zoological Laboratory on the Main Deck, 



3. The Holdfast, .... 



4. Hydraulic Compression Apparatus, 



5. Chemical Laboratory, 



6. Sea-going Sand-Bath, 



7. Carbonic Acid Apparatus, 



8. Apparatus for collecting the Atmospheric Gases from Sea- Water, 



9. H.M.S. Challenger at the New Mole, Gibraltar. 



10. Two views of Umbellula thomsoni, Kbll., 



11. Santa Cruz, Tenerife, 



1 2. Dredging and Sounding arrangements on board the Challenger. 



13. Hydra Sounding Machine, 



1 4. Baillie Sounding Machine, 



15. The Accumulator, 



16. Diagram to illustrate the method of Sounding, 



17. The Cup Lead, .... 



18. The Valve Sounding Lead, 



19. The Dredge, .... 



20. The Beam Trawl used in deep-sea work, 



21. The Sieves, .... 



22. Diagram illustrating the supposed action of the Deep-Sea Dredge, 



23. Ordinary method of using the Tow-Net, 



24. A method of using the Tow-Net in deep water, 



25. The Current Drag, 



26. Diagram to illustrate the action of the Current Drag, 



27. Six's Deep-Sea Thermometer, 



28. Case for enclosing Six's (Miller-Casella) Thermometer, 



29. Negretti & Zambra's Deep-Sea Thermometer; Ferguson's Modification, 



30. Negretti & Zambra's Improved Standard Deep-Sea Thermometer, 



31. Magnaghi's reversing apparatus for Negretti & Zambra's Thermometer, 



32. Siemens' Electrical Thermometer, 



33. Mercury Piezometer, 



34. Enlarged view, showing attachment of bulb to end of Piezometer, 



35. Water Piezometer, ..... 

 36«. Diagram for Water Piezometer, 

 365. Diagram for Mercury Piezometer, 



37. Hydrometer, ...... 



38. Method of using the Hydrometer, . . 



39. The Slip Water-Bottle, ..... 



40. Instrument for slipping the Cylinder at intermediate depths, 



41. Stop-cock Water-Bottle, in section, closed and open, 



42. Buchanan's Improved Stop-cock Water-Bottle, in section, 



43. Depth Gauge, . . . . 



44. Buchanan's Combined Sounding Tube and Water-Bottle, 



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