160 



Meteorological Observations [No. S3, 



volume, and the remaining portion, to the end of 1847, are now 

 being prepared for the press : under these circumstances and to 

 meet the wants of the Meteorologist who has not time to consult the 

 details of observations, I propose here to furnish results only for the 

 period now in arrears, leaving it open to further consideration and 

 discussion — as to what extent the Meteorological results for the 

 future shall be given. 



With regard to the Barometer, the observations which lay most 

 claim to attention, are, -without doubt, those made at the hours of 

 maximum and minimum pressure. On consulting the hourly ob- 

 servations, the instances are comparatively so few in which 9h. 41m. 

 and 3h. 41m. both a. m. and p. m. do not respectively represent 

 these times, that no appreciable error will be committed in their 

 adoption, accordingly the results given in Table I. which now fol- 

 low, may be considered to represent the indications of the Barome- 

 ter at its superior maximum and superior minimum respectively ; 

 the differences between these indications — the " Major diurnal 

 Kange," — exhibit a uniformity in the several months which is at 

 once interesting and striking ; whereas the annual range as well as 

 the time at which the maximum and minimum occurs, is, as might 

 be expected to some extent variable — taking the mean of the a. m. 

 and p. M. observations for each month we get 



Mean Indications of the Barometer at Madras for each Month at 

 Temperature of 32*^ Fahrenheit, 



JaTiuary. . , 

 February . . 

 J^lavch ... 

 April. . . . 



May 



June 



July 



A ugust. . . 

 September. 

 October.. . 

 November. 

 December. 



1841 



1842 



1843 



1844 



1845 



1846 



1847 



Mean. 



Inches 



Inches. 



Inches 



Inches 



Inches 



Inches 



Inches 





29-975 



30-003 



29-989 



30-004' 30-020 



30 •073129. 981 



30-006 





29-975 



•970 



29-988' 29-971 



30 -018 



.958 



29-984 



29-880 



•859 



•8«8 



•908 



•925 



29^918 



.926 



•901 



•843 



•795 



•861 



•803 



•809 



•840 



.828 



•826 



•725 



•704 



•688 



•690 



•704 



•751 



.732 



•713 



•687 



•658 



•702 



•663 



•698 



•709 



.6b3 



.686 



•694 



•690 



•702 



•717 



•716 



•723 



.700 



'706 



•772 



•722 



•754 



•726 



•736 



•744 



.742 



•742 



•743 



•761 



•783 



•787 



•822 



•770 



.744 



•773 



•869 



•870 



•866 



•867 



•849 



•783 



.851 



•851 



•911 



•945 



•926 



•965 



•962 



•9!8 



.934 



-940 



•920 



30-014 



30-004 



•926 



•967 



•966 



.929 



•961 



29-835 



29^833 



29-844^ 29-837 



29^850 



29-851 



29^834 



29^841 



Moreover I have compared each monthly mean with that corres- 

 ponding to each hour, whence the deviations of the Barometer — 

 from its mean state at each hour of the day being known, we can 



