14 Meteorological Observations on Parisnath Hill. [No. 1. 



be the same or nearly the same, as that of the stations, earlier than 

 the curve of the stations. If later it will take place before 9£. 



Considering (Fig. 3,) the rapid asceut of the mean temperature 

 of the stations from 6 a. m. to 2 p. m. — it rises in 8 hours to the 

 same height, from which it takes 16 hours to descend again — and the 

 necessarily retarded progress of the real mean temperature of the 

 stratum of air from its lowest point to its highest, it becomes extremely 

 improbable, that the latter, although its starting point at 6 a. m. is a 

 little above that of the former, should at 9£, after only 3 hours, have 

 reached a higher point than the temperature of the stations. 



If I therefore take 10 a. m. as the extreme limit in the direction 

 of the rising temperature, this will probably be a little higher than 

 would be strictly required. It now remains to find the limit on the 

 side of the lowest temperature. 6 a. m. being the hour of the 

 minimum of the day, is out of the question. The temperature at 

 7 A. M. having risen comparatively little above that at 6, is probably 

 too low, but to make up for the transgression on the other side, I 

 will fix upon 7 as the lower limit.* Among the results included 

 between the hours of 7 and 10, the true height must be found. 



To be certain, I have taken the mean between the heights at 7, 8, 

 9 and 10 on the 1st, 3rd and 4th, a combiuation, in which the higher 

 and lower values would partly compensate each other. The observa- 

 tions were complete for these hours on the 1st April. On the 3rd, 

 the hour of 7 and on the 4th the hour of 10 had not been observed^ 

 For each of these the mean of the values at the same hour on the 

 two other days was taken instead. 



The resulting height is 4039.3 feet. 



I have stated that the trigonometrical station, which is very little 

 lower than the second summit, directly above the temple, was 

 4459.62 feet above the level of Calcutta, b.y the Eecords of the 

 Longitudinal Series. The second summit is, by an observation 

 taken at 7 h. 40 m. a. m. on the 1st April, 429.4 feet higher than 

 the temple, a result, which is probably a little too low. This added 

 to the computed height of the temple, 4039.3 feet, would make the 



* In Europe the best time for taking heights barometrically is between 8 and 9 



A. M. 



