APPENDIX. 



XT. 



Notes on the Fluctuations exhibited in the preceding Table. 



In January 1822, the atmospheric ph.enomena in this month produce no material irregularity in 



the flux and reflux of the mercurial column. 

 February. On the 2d and 3d, the rise and fall appear to be but little and nearly equal, the result 

 was strong winds with rain. On the 6th, 7th, 11th, 12th, 13th, 14th and 13th, similar 

 irregularities occur, and were followed by like results. On the 25th and 26th the rise was 

 great, and the descent of the mercury began before 12 at noon. The result was, both day.s 

 stormy. 

 March 1st and 2d. The rise and fall equal ; the result, squally weather. 

 5th. The fall greatly exceeded the rise ; result, squally weather. 

 6th. 7th and 13th. The rise and fall nearly equal ; result, squally weather, 

 16th. The rise greater than the fall ; result, squalls with thunder. 

 18th. The fall greatest ; resuJt, squalls, thunder, hail and rain. 

 21st and 24th, The fall greatest ; result, strong winds in violent gusts. 



29th. The fall of the mercury began before noon and was great, and between 4 and 6 p.m. it 

 rose one-tenth of an inch. This was followed by a gale of wind, with rain, thunder and 

 lightning. 

 30th. The rise and fall irregular ; the result, storms, with rain, thunder, &c. 

 April 1st and 2d. The rise and fall were irregular, but no material atmospheric changes followed. 

 4th. The fall was great and rise small ; result, squalls, rain and thunder. 

 5th. Both fall and rise, great and equal ; the result, squalls, rain and thunder. 

 20tli to 23d. Rise and fall unsteady. The weather unsettled. 

 May 2d and 3d. Tlie rise small, the fall great. Squally with strong winds. 

 5th. Rise and fall equal ; result, unsettled weather. 



10th, 11th, Uth, 19th, 24th, 27th, and 28th. The fall and rise on these days irregular, and 

 tlie weather squally with strong winds, thunder, and rain. 

 June. The rise and fall of the mercury irregular throughout this month, influenced no doubt by 



the commencement of the periodical rains. 

 July and August, The irregularities noticed last month continue in these months, and may be 



also attributed to the periodical rains. 

 September 1st the fall of the mercury was six times greater than the rise. The result was stormy 

 weather with thunder, lightning, and much rain. 

 9th and 10th. No rise ; the result thunder, lightning, and heavy rain. 

 12th. The rise did not begin before 8 a.m., it was followed by rain. 

 October. The rise and fall of the Barometer on the 2d, 3d, 3th and 6th, were irregular, and the 

 weather within that interval «as squally and wet : but the same irregularity occurred on the 

 1 1th, 16th, 18th, 19th and 20th, without any corresponding atmospheric changes. 

 November. The equality in the rise and fall in the first eight days of this month, has at other 

 seasons of the year been followed with bad weather, but in the present instance no such con- 

 sequence resulted. On the 10th the fall of the mercury began at 1 a.m., and at 2 p.m. it 

 was rising and continued to rise till G p.m. (a very unusual thing). On the 22da similar 

 irregularity occurred, but in both instances was unattended by any material atmospheric 

 phenomenon. 

 December. The oscillations of the mercurial column in this month were active, and variable, but 

 atmospheric changes occurred but seldom. The prevailing winds were N.W. and the weather 

 fine. 



The mean, rise, and fall of the Barometer, in the annexed Table, for each month, is shown by 

 dividing the totals of each column by the number of days in the corresponding month. 



