MAPS AND PLATES. 



To 



PLATE 



I.— Track of H.M.S. ' Lightning '— 1868 



II —First Cruise of H.M.S. 'Porcupine'— 1869 

 III.— Second Cruise of H.M.S. ' Porcupine '—1869 

 IV.— Third Cruise of H.M.S. 'Porcupine'— 1869 



V.— Track of H.M.S. ' Porcupine'— 1870 



VI.— Diagram of the 'Porcupine' Soundings in the Atla: 



TIC AND IN THE F^ROE CHANNEL, SHOWING THE PvELATION 



between Temperature and Depth,— the Serial Sound- 

 ings reduced to Curves. The Numbers refer to the 

 Stations on the Charts, Plates II., III., and IV. ... 



VII — Physical Chart of the North Atlantic : showing the 

 Depth, and the General Distribution of Temperatures 

 for the Month of July 



VIII.— Map showing the General Distribution of the Ter- 

 tiary, the Cretaceous, and the Jurassic Systems 

 in the North-West of Europe with reference to 

 Contour 



face 

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474 



