Sir D. Brewster on his Formulae for Mean Temperature'. 1 35 



Table V. Greatest Variation of the Octogesimal Thermo- 

 meter at Nicolaieff, on the different Days of each Month. 



Table VI. Tlie Means of the Maxima and Minima of each 

 Day, for every Month of the Year. 



[^Observations ofi the joreceding Results. 



In a paper on the Mean Temperature of the Earth, pub- 

 lished in the 9th volume of the Edinburgh Transactions, and 

 also in the Edinburgh Journal of Science, No. VIII. p. 300, I 

 have shown that the temperature of the globe is distributed in 

 reference to two axes different from the axis of rotation ; and 

 I have constructed formulae, founded on this principle, for 

 computing the mean temperature at any point of the earth's 

 surface. In order to compare this theory with observations, 

 especially round the Asiatic Pole of maximum cold, it became 

 desirable to have accurate observations on the mean tempera- 

 ture of various points in the interior of the Russian empire. 

 Professor Hansteen, previous to setting out on his journey to 

 Siberia, kindly undertook to procure for me such observa- 

 tions ; and for the same purpose Professor Kupffer, of St. 

 Petersburg, has had the kindness to send me several valuable 



