state of the Atmosphere for the Science of Meteorology. 49 



represented also latitude, longitude, time, barometer, ther- 

 mometer. How much soever we improve the graphic repre- 

 sentation, we must however always, where there is not merely 

 a view required but an accurate calculation, have recourse to 

 a tabular exhibition. To promote this, the Utrecht Provin- 

 cial Society for Arts and Sciences has issued the following 

 prize question: — 



Since the usual indications of thermometer, barometer, and 

 anemometer throughout the year, that is, the periodical func- 

 tions by which those indications are expressed, are now known 

 for a great number of places, at least with approximation, and 

 thus a sufficient basis is laid for the investigation of non- 

 periodical changes ; the Society wishes — 



After having calculated the mean indications of thermo- 

 meter, barometer and anemometer, over as great a number of 

 places as possible in Europe and Asiatic Russia for periods of 

 five days for two successive years, — 



1. The deviations of thermometer and barometer from their 

 above-described usual state in each of those periods, should 

 be united in tables ; 



2. The manner of transit of those deviations in time and 

 space should be investigated ; and 



3. Those deviations should be compared and brought in 

 connexion with the winds that prevailed during each of the 

 said periods, and with the deviation from their usual direction 

 which they exhibited. 



The importance of this prize proposition in connexion with 

 the various researches which are required for its investigation, 

 has induced the author of this question to augment the offered 

 prize with one hundred and fifty guilders. It is wished that 

 the answer be received before October 1, 1851, by M. C. von 

 Marie, Secretary of the Utrecht Provincial Society for Arts 

 and Sciences. The name of the author, as usual, in a sepa- 

 rate letter. 



Utrecht. 



Postscript. — I have not mentioned in my memoir that the 

 observations instituted by the Royal Society have lately been 

 computed, and that the means of each month are in fact sub- 

 tracted from the mean of the months of the same name. I 

 had not seen the last part of the Philosophical Transactions 

 in which these computations are placed. 



Phil Mag. S. 3. Vol. 37. No. 247. July 1850. 



