•2'21 



Annual means and extremes of the barometer and thermometer, from 

 observations made by G. A. Vandervoort, at Amsterdam, in 

 Holland, Lat. 52° 22' JV. Long, 4° 53' E.. 



THERMOMETER. 



1830, 

 1831, 

 1832, 

 1833, 

 1834, 



758. 

 761.5 

 759.7 



The height of the barometer is given in Millimetres — the mean 

 of the 6 years reduced to English inches, is 29.838. The ther- 

 mometer is graduated to the Fahrenheit, scale, and the r"'^«" 

 the 6 years is 5 1°06. Humbolt " *' 

 from 5 years observations of M( 



Art. XI. Table of Mean Temperatures, S^c. deduced from the Re- 

 ports of the Regents of the University.— By Matthew Henry 

 Webster. 



In the following table the first column contains the names of 

 the different academies at which the observations were made, ar- 

 ranged according to their respective latitudes, beginning with 

 the north; the 2d and 3d contain the latitudes and longitudes as 

 given in the reports, and when these were deficient I have sup- 

 plied them from the county maps in Burr's atlas. The 4th co- 

 lumn gives the elevation above the supposed mean level of the 

 tide; these were also taken from the reports, and the deficienciea 

 I have supplied from the best authorities to which I could refer. 

 The next twelve columns contains the mean temperature of each 

 month. The 17lh column contains the mean temperature of each 

 place, as deduced from the means of the months. The 18th co- 

 lumn contains the mean temperature corrected for the error arising^ 

 from the hours at which the observations were made, which is ac- 

 cording to the Leith hourly observations +.75, to the Plymouth 

 hourly observations -f-. 77; the correction applied is the mean or 

 .76, which has been subtracted. The last column shows the 

 number of years for which observations have been made, and also 

 the names of the years; the letter p, before a number, means that 

 observations were only made during a part of that year, and the 

 letter o, that no observations were made in the year before which 

 it is placed. 



