MAPS AND PLATES. 



PLATE 



I. 



■Track OP H.M.S. *LioHTNiNa'— 1868 



II,— First Cruise op H.M.S. 'Porcupikb'— 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 op the 'Porcupine' Soundings in the Atlan- 

 tic AND IN the FiSROE CHANNEL, SHOWING THE RELATION 



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, — Phtsical Chart op the North Atlantic : showing the 

 Depth, and the General Distribution of Temperatures 

 FOR the Month op Jult , 



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

 tiary, THE Cretaceous, and the Jurassic Systems 

 IN THE North-West op Europe vith reference to 

 Contour 



To face 

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