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



that the interpolated values could not have differed from the real 

 ones more than the unavoidable smaller errors of observation might 

 have amounted to. 



The temperatures were interpolated in a similar manner. 



The curves Fig. 1 and 2 in the plate graphically represent the 

 hourly changes of the barometer, the first at Calcutta where the 

 observations were complete for the 24 hours, and the second on 

 Parisnath hill. 



In constructing the curve of the hill, the hours after 4 p. M. on 

 the 1st have not been included. Their readings are indicated by 

 dots in the figure. The general regularity of all other parts of the 

 curve in themselves as well as with reference to the Calcutta curve, 

 and the absence of disturbing influences in the atmosphere at the 

 time, justify a conclusion that the observations of the hours in ques- 

 tion should not have formed an exception to that regularity. 

 Taking into consideration some other external circumstances, accom- 

 panying these observations, which could have contributed to make 

 them uncertain, and no data being available for correcting them, 

 they were rejected. Their evidence goes only so far with certainty 

 as to show the turning of the curve in the evening between 4 and 5 

 p. m. The observations of the 2nd April could also be used only 

 for general conclusions. The first, at 9 h. 15 ra. a. m. is evidently 

 erroneous, as will be seen further on, from the curve of real mean 

 temperatures. 



The observations on Parisnath hill were made by Calcutta time. 

 The difference in Longitude between Calcutta and Parisnath is 2° 

 29' 23" which would correspond to between 9 and 10 minutes time. 

 This difference is so small that it would produce no sensible effect 

 upon the barometrical hours, and its influence may therefore be 

 neglected in comparing the observations at both places with each 

 other. 



I shall now enter upon a closer examination of the observations 

 made on the 1st, 3rd and 4th April, omitting those of the 2nd and 

 also the barometric readings of the hours after 4 p. M. on the 1st, 

 retaining however the temperatures of these hours. 



Barometric Curves. — The barometric readings for the full hours 

 are given in the following table: — 



