XxXx1l* THE METEOROLOGY OF THE PLAINS 
pose. As the several barometers were never absolutely compared together, entire dependence cannot be 
placed upon the mean altitudes given; but with regard to Calcutta, Benares, and Saharunpore, as some 
opportunities occurred of comparison through the instruments of different travellers, the relative altitude 
of these places can be estimated tolerably well: thus, Saharunpore will be found to be almost exactly 
one thousand feet above the sea, as was before estimated by Captain Hodgson. Benares, in like manner, 
may be safely stated, in even numbers, to be three hundred feet above the sea, 
Montuty Deviations of the Barometer and THERMOMETER from their annual mean height at 
Calcutta; and at several other places, introduced for the sake of comparison. 
BAROMETER AT 32° Fanr. THERMOMETER. 
MontxH. Benares, Madras, 
mean 9€ | aya, rego, |o. 2h | US | Sebarur- |meanot st | va, 1800] a years ob year ab Seber 
iF96 0 1821. 1320-30-31] pfations, | 1826-27. servations, | 4a. [Tos minsmax.de min, 1826-27 
Inch, Inch. Inch. Inch. Inch, D 5 Deg. Deg. Deg. 
January ...sscseceeseeee| +146 | 4-299 | 4-208 | +-273 | +274 | —os | —137 | —IT'6 | —17°0 | 218 
February. ..ecccccesccscs +°131 +115 +172 +°175 +219 —4°5 —_ 4:9 = 6-0 a] 15 —?20°9 
March eeeecessessesesees +:087 +:051 +:095 +:107 +:151 —1-8 _ 2°38 + 1:0 —_ 15 a 0+] 
Aprils sascvecissskesseto| 006 | 0081 20901 043 | 4-06 | 07 | 7-8 | + 61] 4 95 | 461 
BY eocececesescccscvnace —°124 — 105 —152 — 136 — 060 +52 + 5-6 _ Lo +13-9 +11°6 
June seeeseseceseessenee — 117 —°156 —:248 —289 — 217 +74 + 71 _ 5:5 +13-1 +17°5 
July seseecececcceceseees| —*103 | —176 | —-218 | —-308 | —398] +3-9| + 4-4] + 46] + 6:9} +128 
August eoereeessessseee —-088 — 126 ict] 94 —203 —278 +30 + 4] a 3°6 + 6-4 + 10-0 
September er eeeeresesesee — 057 — 098 —-] 15 — 098 —158 +2-1 + 4:3 + 3°7 oa 5:8 — 95 
October eee seseeseeeesee — (018 — 010 +-020 +:07 — 047 +0-1 + 2-2 + 9-5 + 1:3 — 0-8 
November eesesseseseses +-006 +102 +:161 +:181 +-209 a3] _ 4-2 — 54 —_ 9-7 pee | 0-8 
December eeeeesesresess +:124 +:201 +258 +27) +°245 —49 —10°1 ib E85 —17 6 pre Os 8 
Ann. mean....| 29-810 | 29-573 | 29-764 | 29-464 | 28-766 | 81-69 | 78-39 | 78-13 77°81 W3°5 
Range.--e0+--| -270| -405| -506| -587| 672) 139] 21-5] 191] 31:5| 393 
** It will be remarked, that the range of variation in the weight of the atmosphere increases with the 
latitude, even up to the foot of the Himalaya Mountains, and that it is accompanied by a corresponding 
increase in the range of the thermometer. 
*¢ We now come to the diurnal oscillation of the barometer, for which the same sources have furnished 
me with materials for framing a comparative table for five localities considerably distant from one 
another; we could have added Moorshedabad to the list, but that the thermometric series for that 
place was incomplete. At Saharunpore the horary observations were confined to a single day, the 
fifteenth of each month; at Madras to three similar days ; at Benares, perhaps, the hour of the minimum 
was not always exactly observed ; thus a little irregularity must be expected, but on the whole the 
results are wonderfully equable. 
Divenat Oscittations of the BaromETER and THERMOMETER at Calcutta, with Comparative 
Observations at other places. 
BaRroMETER AT 32°. THERMOMETER. 
Monts. | Madras, icsta, Benares, | Saharun- | | Benares, | Saharun- 
min.} Ava, pore, max.} Madras. 
every tenth|10 a.m. and) 940 a.m. 90 104.004 tin, off 4A. and HR Bt 
bess daily ex- | pore, 
un-rise 
oe 4pm, jand4 0pm) 4 io¢%,| medayin} 2 p.m, | 4 P.M, ie register | one day in 
; —— “072 ‘ “144 "123 “097 “103 nb A a0 is on 
Fel PUAN Y+ +e eres evecesere 070 “126 117 103 *093 10-0 i 16-8 18+5 19-2 21-0 
P io. SRE ‘076 “107 +125 "121 *146 7:0 90-8 14-0 20°7 26-0 
A ru tele a eke tenn “081 “110 "124 "125 107 9-0 20-9 14-6 23-2 31-0 
BY sev wcasesccnascenves “081 “113 “115 +124 -160 9-() 20-4 13-7 21:9 38:0 
June eee ee eres ereseeves +092 *136 095 113 "178 9-0 9-0 : 5 
€ : . “6 16-1 ol 
pl eioky ahsas trae gee ie tale “097 +133 -090 077 103 7-0 6°6 my 9-0 153 
‘a UGUSE. ee eeevesececeeses, “15 109 “099 088 079 70 8-8 5-9 8-3 11-5 
September ere seesasesean 094 +145 ‘101 103 “123 6-0 7:8 6 2 10-3 13-0 
October cesar eessessenes 068 “144 ~ “110 : “100 120 8-0 : 
ohes 5-0 . : 
Soncuee: seeeeesccscecs ‘071 *127 "107 ‘107 “147 8-0 6-7 ind tee os 
CINDCr ceocvtecicscvrcs 071 "126 114 “098 .*]94 9-0 85 17-1 16:3 17:5 
~ Mean tide ........} 081 126 110 105 120. 8:5 10-6 12-2 16-6 24-2 
