= ATMOSPHERIC PRESSURE. 92] 
TABLE XIX.—Extreme Readings of the Barometer for each Month; Extreme Mean Daily Heights 
for each Month ; and Extreme Diurnal Ranges for each Month, together with the Ranges and 
Means of the Extremes. 
Extreme Readings. Extreme Daily Means. Extreme Diurnal Ranges. 
Highest. Lowest. Range.| Mean. Highest. Range. | Mean. Greatest. Least. 
F . in. 5 in. in. in. a. in. 5 in. in. : in. i in. 
January 30-196 27-837) 2-359 |29-016)| 19 : 5 2-147 |29-095 1-044 2 | 0-060 
February 30-063 28-770} 1-293 |29-416|| 7 D 1-112 | 29-470 0-660 
March 30-158 28-969| 1-189 |29-563) 8 |30- 5 1-062 |29-594 0-669 
April 29-836 8 |28-953/ 0-883 |29-395 . 0-765 |29-408)\; \ 0.509 
May 30-200 29-108} 1-092 | 29-654 = 1-043 | 29-662 0-400 | 
June 29-996 28-618] 1-378 |29-307 : 1-145 |29.410 0-597 | 
July 30-030 29-135] 0-895 |29-582 ; 0-762 |29-618 0-519 
August 30-048 29-065] 0-983 |29-556 : 0-892 |29-576 0-510 
September |} 2 30-368 29-385] 0-983 |29-876 - 0-823 |29-911 0-412 | 
October 30-161 28-415] 1-746 |29-288 E 1-519 |29.345 0-724 | 
November 30-165 28-647] 1-518 |29-406 : . 1-117 |29-521 0-655 | 
December 30-207 29-462) 0-745 |29-834 * 0-642 |29-866 0-481 | 
Extremes of Atmospheric Pressure for 1843. 
in. : 
Ly ae Ms ad her ‘ in. 1n. 
Highest barometer occurred September 224 22 = 30 a Range = 2-581, mean = 29-109. 
Lowest s+: s+se0sseeeseeseeeeeeeeee January 134 22 = 27-837 
Highest daily mean occurred--- September 234 = 30°323 a ees 
Lowest -++---ssseeeeeeeeeeeeeeeeee January 184 — 28-029 Range = 2°301, mean = 29-172. 
Highest monthly mean occurred December = 29-963 iy. i 
WGOWESH (c2-=-0cesiactlnv= Js besltesiecs January = anes Range = 0:605, mean = 29-660. 
. ‘ in. 
The greatest diurnal range of pressure occurred ...............4.. January 94, = 1-044. 
SRM CAStitee Meee Rees oR ace sale ce Mekiiondhs sadstalbinsstees velsivas cobs June 124, = 0:021. 
j The greatest range of pressure for a month occurred ......... ».. January 1384—192, = 2°359. 
} Mheilenst HA epeeeeee el saat hens iSslideda ve seesesetne Be SCAR AEROEEE December, = 0-745. 
The greatest range of mean daily pressure for a month occurred January 134—194, = 2-147. 
ewe stam. <eenReRe eee otal stele cert aene Soamwan natin smceteaitne December, = 0642. 
The mean of the highest and lowest readings in the year is 0:507 in. less than the mean for the year; the 
mean of the highest and lowest daily means is 0°437 in. less than the mean for the year. If we compare 
similarly the means of the highest and lowest readings and daily means in each month with the monthly means, 
we obtain the following results :— 
eae 
Monthly Means minus Mean of Highest and Lowest Readings in each Month. 
Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. 
in. in. in. in, in. in. in. in. in. in, in. in. 
+0°341 40-083 +0:099 +0°092 —0:034 +0°312 +0-053 +0:100 +0:059 +0113 +0-065 +0-128 
Monthly Means minus Mean of Highest and Lowest Daily Means in each Month. 
Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. 
in. in. in. in. in. in, in. in. in. in. in. in. 
+0262 +0:029 +0-068 +0:079 —0:042 +0:209 +0:017 +0:080 +0:024 +0:056 —0-050 +0-096 
MAG. AND MET. oBs. 1843. 4B 
