1858.] Meteorological Observations on Parisnath Hill. 3 



It appears that from the 1st to the 3rd, the southerly wind, 

 which was at first only observed at Calcutta, had, gradually pro- 

 gressing, replaced the North Westerly breeze at Parisnath, the 

 change having been completed on the 4th. 



The barometer t used on the hill was a mountain barometer by 

 Adie, suspended in a tripod, which had been compared with the 

 standard barometer of the Calcutta Observatory ; before each read- 

 ing, the surface of the mercury in the cistern had to be adjusted to 

 the scale. All observations, with the exception of those on the 

 summits, were taken in the open verandah of the temple. The in- 

 strument, to avoid the sun, had to be carried from one part of the 

 verandah to the other, several times during the day. 



The thermometers were centigrade; they had not been compared 

 with the standard of the observatory, but with another reliable 

 standard. The temperature of the air was measured in the shade 

 of a small tree on the North side of the temple, between it aud the 

 hill side, a place, which was little accessible to the direct rays of 

 the sun, but where the air circulated freely. 



A few observations with the wet bulb thermometer were made on 

 the 2nd and 3rd April. 



The Calcutta observations have been obtained through the kind 

 permission of Major Thuillier from the Register of the Observatory, 

 where observations are taken every hour. 



The following table gives the readings of the barometer and 

 thermometer on the hill, and those at the corresponding hours 

 at Calcutta. The barometrical readings of both places are correct- 

 ed for temperature and those of the hill also for the standard baro- 

 meter of the Observatory. The thermometrical readings are also 

 corrected. 



b 2 



