Variation of Temperature in the British Isles, &c. 



85 



The climatic conditions at a place like Kew, for example, which is 

 not far from the sea, and which may be regarded (according to fig. 1) 

 as having an original planetary temperature range of 10 0> 6 F., and a 

 resultant range of 24 F., may be contrasted with those for such a 

 station as Nertchinski-Zavod,* at about the same latitude, with a 

 range of over 120 F. Its maximum is reached by the middle of July, 

 consequently the composition of the original planetary range with the 

 range due to the surrounding region is almost algebraical. On that 

 understanding, and assuming that the planetary range is the same as 

 that at Kew, we find that the influence of the surrounding land at 

 Nertchinski-Zavod is to increase the range by 110 F., whereas the 

 effect of the sea at Kew only adds 13 '6 F. to the range, i.e., less than 

 one-eighth of the land effect on the same latitude. The corresponding 

 diagram would be as represented in fig. iii upon a scale of temperatures 

 one-third of that of the other figures. 



B 



A 5-3F. C 



C 1 



It is not, of course, a legitimate assumption that the planetary range 

 corresponding to the latitude of Kew is accurately represented by 

 10 '6 F., which requires only to be compounded with the sea effect to 

 produce the resultant oscillation. The resultant effect at Kew is 

 probably resolvable into three components one the original planetary 

 effect with its maximum in June, a second due to the surrounding 

 land with its maximum in July, and the third due to the sea with its 

 maximum in August. The precise epoch of maximum of the land 

 effect, which would identify the direction of its line on the diagram, 

 and the actual magnitude of any one of the component effects, which 

 would fix the position of the lines in the diagram, are not at present 

 determinate, but their extreme limits are known. 



* Atlas Climatologique de 1'Empire cle Bussie. St. Petersburg, 1900. 



VOL. LXIX. 



