On the Surface Temperature of North Sea and North Atlantic. 33 



Iceland. (4) We can distinctly trace a tendency to acceleration of 

 phase as we pass northwards, the mean maxiniuni temperature being 

 apparently from a week to a fortnight earlier in tlie upper part of 

 the diagram than in its southern portion. 



The diagram for ].^° W. (Fig. 2G) shows no very important points 



65 



60* 



55 - 



50' 



Fig. 27.— The same for 10' W. 



of difference from tlie former one : but on careful examination it will 

 be seen that the temperatures are throughout a little higher than at 

 20° \V., for reasons which are connected with the system of currents 

 and which we have already sufficiently explained. 



By the time we reach the meridian of 10" W. (Fig. 27) close to 

 the coast of Ireland (and indeed as this meridian cuts the Irish coast- 



3 



