Pressure of Aqueous Vapour. 



413 



Pressure op Aqueous Vapour. 



TABLE X. — Daily, Weekly, and Monthly Means of the Pressure of Aqueous Vapour, in inches of 



Mercury, as deduced from Tables I. and VII. 



Civil 

 Day. 



Jan. 



Feb. M 



arch. 



April. I 



'fay. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



1 



0-168 



•150 



211 



0-263 



• 252 



0-303 



0-338 



0-370 



[0-390] 



0-330 



0-239 



[0-230] 



2 



•147 



•186 



•197 



•289 



•307 



[ -323] 



•321 



•349 



•387 



•316 



•218 



•226 



3 



•184 



■170 [ 



■183] 



•266 



•273 



•285 



•347 



•336 



•390 



•325 



[ -254] 



•221 



4 



•216 [ 



•162] 



181 



•242 



•296 



•340 



•318 



[ -368] 



•424 



•282 



•238 



•183 



5 



•311 



•151 



151 



•230 [ 



291] 



•415 



•345 



•393 



•440 



•281 



•265 



•156 



6 



•277 



•139 



159 



•223 



326 



•433 



•356 



•384 



•472 



[ -272] 



•278 



•136 



7 



[ -243] 



177 



165 



[ -266] 



■286 



•423 



[ -352] 



•378 



•479 



•215 



•261 



•137 



8 



•224 



•183 



198 



•303 



258 



•382 



•334 



•358 



[ -400] 



•235 



•289 



[ -165] 



9 



•194 



203 



257 



•355 



280 



[ -374] 



•376 



•322 



•351 



•292 



•281 



•186 



10 



•234 



167 [ 



196] 



■242 



303 



-325 



•382 



•308 



•314 



•336 



[ -259] 



•192 



11 



•253 [ 



201] 



222 



•216 



336 



•321 



•346 



[ -354] 



•344 



•328 



-219 



• 181 



12 



•261 



180 



174 



•257 [ 



300] 



• 363 



•323 



•380 



■295 



•335 



•227 



•164 



13 



•198 



210 



163 



•263 



324 



•401 



•364 



•384 



• 315 



[ -318] 



■275 



•160 



14 



[ -214] 



263 



174 



[ -255] 



302 



•332 



[ -330] 



•373 



•387 



321 



•242 



•197 



15 



■166 



243 



197 



•303 



253 



•309 



•314 



•388 



[ -337] 



•300 



•309 



[ -200] 



16 



•188 



202 



171 



•221 



259 



[ -346] 



•303 



■367 



•393 



•287 



•326 



•210 



17 



•220 



233 [ 



188] 



•269 



202 



•333 



■333 



•352 



• 358 



■270 



[ -304] 



•237 



18 



•230 [ 



191] 



174 



•231 



188 



•370 



•347 



[ -356] 



• 275 



•231 



•317 



•232 



19 



•198 



192 



221 



•306 [ 



235] 



•334 



■320 



•368 



•305 



•219 



• 340 



•193 



20 



•166 



141 



192 



•345 



217 



•327 



•310 



•338 



• 285 



[ -231] 



•290 



•147 



21 



[ -204] 



134 



176 



[ -269] 



271 



•413 



[ -390] 



•324 



■253 



•223 



•229 



•169 



22 



•210 



126 



250 



•268 



274 



•379 



■447 



•366 



[ -282] 



•235 



•189 



[ -176] 



23 



•216 



156 



232 



•262 



272 



[ -370] 



•430 



•369 



•269 



•207 



■227 



•180 



24 



•202 



181 [ 



243] 



•202 



270 



•466 



•489 



•352 



• 288 



•209 



[ -224] 



•184 



25 



•255 [ 



162] 



251 



•277 



244 



•334 



■430 



[ -327] 



•290 



•284 



•185 



•182 



26 



•223 



162 



249 



•240 [ 



262] 



•304 



•444 



•296 



•384 



•275 



•224 



•185 



27 



•284 



151 



298 



•209 



257 



•289 



•471 



•271 



•416 



[ -264] 



•292 



•191 



28 



[ -227] 



195 



224 



[ -236] 



265 



•342 



[ -409] 



•311 



•373 



•253 



•280 



•181 



29 



•237 



199 



291 



•242 



262 



•336 



•343 



•345 



[ -350] 



•276 



•253 



[ -194] 



30 



•200 





253 



•197 



298 



[ -329] 



•375 



•372 



•280 



•290 



•218 



•213 



31 



•164 



[ ■ 



264] 





296 





• 394 



•420 





•284 





•210 



Mean 



0-216 



180 0- 



209 



0-258 0- 



273 



0-354 



0-367 



0-355 



0-351 



0-276 



0-258 



0-187 



Annual Variation of the Pressure of Aqueous Vapour. — This variation follows the same law as that of 

 the temperature of the air. The pressure is a maximum in July and a minimum in February and December. 

 The means for the meteorological seasons are — 



Winter, Dec, Jan., Feb., 0T95 

 Spring, March, April, May, 0-247 



Summer, June, July, Aug. 0-359 

 Autumn, Sept., Oct., Nov. 0-294 



The mean pressure of aqueous vapour for the year 1844 = 0*274 in. 



MAG. AND MET. OBS. 



1844. 



5 M 



