ATMOSPHEROLOGY. — TEMPERATURE. 359 



The diiFerence between the mean temperature of 

 the year and that of July, is 21j° in Stockhohn, 

 and 20* near Spitzbergen. Finding not only that 

 the difference of temperature between the mean of 

 the year and July, near Spitzbergen, but that the 

 progressive increase of temperature from April to 

 July, also bore a strong analogy to the relative cir- 

 cumstances at Stockholm, I formed a scheme of de- 

 cimals connected with a simple formula, by which 

 the same proportion of change which has been obr 

 served to take place every month at Stockholm, may 

 be very readily applied to any other country*, 

 whence, situation and circumstances being near- 

 ly similar, the temperature of unobserved months 

 may be calculated. The data requisite, are the tem- 

 peratures of January and July, or the mean of the year 

 and July. My observations on the temperature of 

 the atmosphere in the Greenland sea, afford the lat- 

 ter data, from which, by the formula in the Ap- 

 pendix, I have calculated the last column but one 

 in the foregoing table, which agrees so nearly with 

 the results by observation, as to afford a strong pre- 

 sumption of the fairness of the inferences. Ey the 

 same rule, the temperature of January, latitude 78', 

 comes out — 1', that of February 0°.7, March 6M, 

 August 34*.9, September 27°.8, October 18°.5, 

 November 9.8, and December 3M. 



It might be urged against the truth of these in- 

 ferences and calculations, that southerly winds may 



* See Appendix, No. II. Tables F and G. 



