Meteorological Observations. XXXi 
Abstract of the Results of the Hourly Meteorological Observations 
taken at the Surveyor General's Office, Calcutta, 
in the month of April, 1865. 
Montuty Resvrts. 
Inches 
Mean height of the Barometer for the month, .. ee o. 29.795 
Max. height of the Barometer occurred at 10 a. M. on the 13th, e. 29.985 
Min. height of the Barometer occurred at 5 p. M. on the 29th, ee 29.526 
Extreme range of the Barometer during the month, o. es 0,459 
Mean of the Daily Max. Pressures,.. oe ee ee 29.871 
Ditto ditto Min. ditto, .. ee oe ees aly/ 
Mean daily range of the Barometer during the month, .. ee =: 0,154 
o 
Mean Dry Bulb Thermometer for the month, .. oe oe 84.5 
Max, Temperature occurred at 3 P. M. on the 4th, oe oe 98.2 
Min. Temperature occurred at 6 A. u. on the Sth, 5h ae 72.4 
Extreme range of the Temperature during the month, ae we 25.8 
Mean of the daily Max. Temperature, oe «es oo 93.5 
Ditto ditto Min. ditto, .. sd oe ee 77.8 
Mean daily range of the Temperature during the month, .. ss 15.7 
Mean Wet Bulb Thermometer for the month, .. a aa 97.7 
Mean Dry Bulb Thermometer above Mean Wet Bulb Thermometer, .. 6.8 
Computed Mean Dew-point forthe month, .. es ae 72.9 
Mean Dry Bulb Thermometer above computed Mean Dew-point, As 11.6 
Inches 
Mean Elastic force of Vapour for the month, .. ve ce O47 

Troy grains 
Mean Weight of Vapour for the month, se ee « 8.52 
Additional Weight of Vapour required for complete saturation, me 3.83 
Mean degree of humidity for the month, complete saturation being unity, 0.69 
. Inches 
Rained 8 days, Max. fall of rain during 24 hours, és at 1.67 
Total amount of rain during the month, ee ee aa 4.28 
Prevailing direction of the Wind, .. oe oo S.&S. W. 
