1858.] Meteorological Observations on ParisnatJi Hill. 11 



3. Here, the maximum on the 3rd is also a little higher than on the 

 1st ; it occurs at 2 p. m. on the 1st ; while on the 3rd the tempera- 

 ture at 3 is the same as at 2 p. m. 



Taking the values obtained for the means of the whole day at 

 each station, 30°.l and 24°.4 on the 1st, and 30°.4 and 25°.4 on the 

 3rd, the daily mean temperatures for the air between the stations 

 will be 27°.3 for the 1st, and 27°.9 for the 3rd, showing a differ- 



, no a rp, T • ,• VI. a. + X. a. -f IV. p. -f- X. p. 



ence or 0°.6. The combination — 



4 



applied to the hourly means, will give very nearly the same results, 



viz., 27°. 6 and 27°.9. The temperature at 9| a. m. approaches 



nearest to the mean temperature of the 24 hours on both days. 



The hourly means, derived from the observations at both stations 

 are supposed to represent the mean temperatures of the stratum of 

 air extending between the two stations, and they enter as such into 

 the calculation of the height. It is well known that they have not, 

 in reality, that signification, and to distinguish them from the real 

 mean temperatures, I shall speak of them, in the following pages, as 

 the mean temperatures of the stations. 



Height. — The height of the temple and the summits was calculated 

 by G-auss's formula, with the corrections for the decrease of gravity 

 by latitude and elevation. The results in English feet, are arranged 

 in the following table by the hours. 



c 2 



