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Reduction of the Meteorological Register, kept at the Surveyor Gene- 

 ral's Office, Calcutta, for the year commencing on the 1st November 

 1843, and terminating S\st October 1844. By J. M'Clelland. 

 Meteorological Registers are intended to afford materials for the 

 investigation of climate, and if held available in the places where 

 they are kept to persons engaged in researches of this nature, 

 publication may be well dispensed with. They are bulky if given in 

 detail, and useless if too much abridged, while in any case they are 

 seldom referred to. 



For these reasons, I discontinued the publication of the usual 

 abstracts from the very copious register kept at the Surveyor Gene- 

 ral's Office, by Mr. Rees, since October 1843. I now propose to 

 give the general results to be deduced from these records since the 

 latter period. 



The prevalence of small-pox and of cholera in March and April 

 last, and of a peculiar form of brain fever which set in the early part 

 of the rains, may render the subject more interesting as accounting 

 for those complaints by the unusually early setting in of the hot 

 season, its violence and protracted length. The late and irregular 

 appearance of the rains, while the heavy falls of rain in August 

 and September, and the consequent diminished temperature of those 

 months, will account no less satisfactorily for the unusual healthiness 

 of that part of the season. 



The observations were made at sunrise, 9h. 40m., noon, 2h. 40m., 

 4h., and at sunset ; in all at six different periods. The lowest daily 

 temperature is at sunrise, the highest at 2h. 40m., and this holds good 

 throughout the year. The lowest temperature observed was on the 

 19th January, when the thermometer stood at 51.7 ; the highest was 

 on the 10th of April, when the thermometer stood in the shade 

 at 104. The mean temperature of December, the coolest month of the 

 year, was 72.02 ; and of April, the hottest month of the year, 89.6 ; the 

 mean temperature of the whole year founded on six daily observations 

 at the hours above stated is 82.35.* The mean minimum is 81.15, 

 and the mean maximum is 93.67. 



* The mean of a fractional difference between Tab. I and Tab. XIX the results being in the 

 first case obtained from the sums of the columns for each month, and, in the second frcm 

 the daily average. 



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