450 Meteorological Observations in Upper Assam. 



Greatest variation, Bar. 0.60 inch. Ther. 48.5o. 

 Rain during the year 92.1 inch. 

 Nazera, 3\st December, 1842. 



Exhibiting the Mean Pressure and Temperature in a Tabular form, we have 

 Mean Pressure Mean Temperature. 





1840. 



1841. 



1842. 



Mean of 

 3 years. 



1840. 



1841 



1842, 



Mean 

 of 3 

 ye u-s. 





Inches. 



In. 



In. 



In. 



o 



o 



o 



o 





29:471 



29^488 



29^465 



29-475 



58 ^87 



61-36 



61-09 



6r44 



February, .... 



•389 



•483 



•425 



•432 



64-40 



63-73 



64-57 



64-23 



March, .... 



•325 



•342 



•362 



•343 



71-23 



66-27 



66-57 



68-02 





•264 



•315 



•279 



•286 



74-24 



70-73 



71-20 



72-05 





•212 



•249 



•203 



•221 



79-23 



75-97 



80-03 



78-41 





•093 



•109 



•136 



•113 



81.00 



81-66 



81-85 



81-50 





•1S5 



•093 



•058 



•112 



84-53 



83-03 



80-71 



82-75 





•141 



•175 



•138 



•151 



83-09 



81-02 



81-83 



81-98 



September, . . 



•124 



•215 



•224 



•188 



80 92 



81-67 



82 62 



81-73 



October, .... 



•315 



•309 



•371 



•358 



79-08 



76^10 



76-20 



77-12 



November, . . 



•403 



•417 



•469 



•430 



67-48 



67-54 



67-25 



67^42 



December, '. 



•449 



•419 



•475 



•447 



60^45 



60-87 



60-00 



60-44 



From this is deduced annual mean pressure 29.2968 inches, annual 

 mean temperature 73.09°. The observations from which the fcJregoing 

 means have been obtained were made at sunrise, 2 p. m., and sunset, an 

 not at the time of the maximum and minimum pressure, but of th 

 mean pressure merely. Where the terms Greatest pressure observed, least 

 do., are used, the maxima and minima are not thereby intended, but 

 the greatest or least pressure at the usual time of observations. It may 

 also be remarked, that from observations made at the time above 

 stated, the diurnal tide of the Barometer is scarcely perceptible. The 

 following horary observations shew that the mercury in the Barometri- 

 cal tube is subject to the same diurnal and nocturnal ebb and flow in 

 Assam, as has been observed in other parts of the world. The first 

 series commenced on the 10th July, 1842, at 6 a. m. amidst heavy rain. 



