327 



The December of last year, which was much warmer than the 

 Decembers of the two preceding years, appears thus to comply with 

 such conditions as to temperature as would lead to the conclusion 

 that a greater extension of the Gulf-stream had existed about the 

 end of 1857, than towards the close of 1856 or 1855. 



Isothermals of the British Isles*. 



It will be interesting to compare the mean temperature of a southern 

 inland station, where the observations may be depended upon as being 

 of the best class. The mean temperature of Oxford during the 

 December of 1857 was 45-0 ; in December 1856, 40'5 ; in December 



* The figures denote the mean annual temperature, in degrees Fahr., corre- 

 sponding to each isothermal line. 



