276 
Abstkacts of the Makekstoun Obsekvations., 1843. 
From the periods for the four astronomical seasons, it is evident that the minimum humidity occurs earlier 
in Summer than in the preceding and succeeding quarters. For the astronomical seasons, the minimum hu- 
midity occurs after the maximum temperature of the air in Spring and Autumn, while it occurs hefore the 
maximum temperature in Summer and Winter. In the mean for the year, the minimum humidity occurs 
about 20 m after the maximum temperature, and about 50 m after the maximum pressure of aqueous vapour. 
The secondary maxima and minima, shewn in some of the monthly means for the pressure of aqueous vapour, 
have no counterparts in the means for the humidity. 
The ascending or forenoon branches of the diurnal curves of temperature and pressure of aqueous vapour 
exhibit more rapid changes than the afternoon or descending branch ; while, for the humidity, the afternoon or 
ascending branch has the most rapid variations. In the mean for the year, however, the variation is but slightly 
more rapid in the afternoon than in the forenoon branch. These remarks have reference to the portion of the 
diurnal curve included in the limits of the observations for 1843, viz., 5 a.m. till 9 p.m. 
The mean humidity for the year occurs at 8 h 28 m a.m. 
'• 6 h 40 m p.m. 
The interval between these periods is, 10 h 12 m 
Diurnal Range of Humidity. — The diurnal ranges, as far as can be judged from Table XIV., are some- 
what less in the summer months than in the months immediately preceding or succeeding them. 
TABLE XV.— Daily, Weekly, and Monthly Means of the Height of the Barometer in 1843. 
Civil 
Day. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
iu. 
in. 
in. 
in. 
in. 
in. 
in. 
1 
[ 1 
29-256 
29-630 
29-026 
30 1 .'l84 
29-335 
29-558 
29-505 
30-059 
[29-677] 
29-515 
29-903 
2 
29-901 
29-093 
29-881 
[29-243] 
30-070 
29-055 
[29-530^ 
29-264 
30-078 
29-700 
29-645 
29-894 
3 
29-880 
28-914 
30-015 
29-369 
29-717 
26-189 
29-471 
29-130 
[30-060] 
29-780 
29-358 
[29-834] 
4 
29-460 
29-469 
30-108 
29-185 
29-399 
[29-4001 
29-661 
29-190 
30-075 
29-767 
29-328 
29-945 
5 
29-603 
[29-559] 
[30-008] 
29-382 
29-270 
29-682 
29-458 
29-424 
30-146 
29-684 
[29-385] 
29-545 
6 
29-713 
29-856 
29-929 
29-318 
29-272 
29-693 
29-379 
[29-545] 
30-046 
29-204 
29-424 
29-810 
7 
29-292 
30-026 
29-991 
29-050 
[29-544] 
29-449 
29-579 
29-826 
30-042 
29-056 
29-232 
29-678 
8 
[29-108] 
29-997 
30-125 
29-132 
29-585 
28-848 
29-695 
29-838 
30-032 
[29-295] 
29-325 
29-86S 
9 
28-967 
29-987 
30-098 
[29-429] 
29-756 
28-838 
[29-734] 
29-865 
29-962 
29-337 
29-585 
29-995 
10 
28-443 
29-978 
29-806 
29-678 
29-982 
29-429 
29-864 
29-926 
[29-997] 
29-537 
29-323 
[29-943] 
1 1 
28-632 
30-007 
29-847 
29-763 
29-976 
[29-502] 
29-999 
29-993 
29-823 
28-952 
29-S3S 
29-950 
12 
28-669 
[29-757] 
[29-623] 
29-631 
29-796 
29-983 
29-891 
30-022 
30-111 
29-060 
[29-770] 
30-119 
13 
28-022 
29-777 
29-218 
29-693 
29-498 
29-956 
29-841 
[29-920] 
30-011 
29-290 
29-957 
30-0^7 
14 
28-389 
29-550 
29-196 
29-473 
[29-614] 
29-961 
29-805 
29-886 
29-7S8 
29-544 
30-080 
29-953 
15 
[29-049] 
29-242 
29-572 
28-745 
29-401 
29-975 
29-739 
29-830 
29-746 
[29-409] 
29-836 
29-S45 
16 
29-453 
29-107 
29-722 
[29-693] 
29-397 
29-916 
[29-699] 
29-861 
29-781 
29-36S 
29-S00 
30-054 
17 
29-777 
29-420 
29-520 
29-778 
29-618 
29-8S4 
29-848 
29-890 
[29-837] 
29-371 
29-3S4 
[30-027] 
18 
29-985 
29-550 
29-665 
29-791 
29-830 
[,29-877] 
29-506 
29-875 
29-81S 
29-S24 
29-073 
30-1S7 
19 
30-169 
[29-340] 
[29-473] 
29-679 
29-856 
29-839 
29-454 
29-649 
30-044 
30-105 
[29-226] 
30- 1.34 
20 
30-014 
29-327 
29-550 
29-519 
29-749 
29-911 
29-317 
[29-567] 
29-844 
29-S03 
29-094" 
29-992 
21 
29-730 
29-325 
29-219 
29-561 
[29-690] 
29-73S 
29-360 
29-597 
29-924 
29-602 
29-042 
30-036 
22 
[29-725] 
29-310 
29-163 
29-548 
29-555 
29-S09 
29-362 
29137 
30-23S 
[29-564] 28-963 
29-7S4 
23 
29-535 
29-390 
29-250 
[29-495] 
29-601 
29-852 
[29-601] 
29-255 
30-323 
29-503 
29192 
29-934 
24 
29-365 
29-551 
29-594 
29-775 
29-549 
29-862 
29-793 
29-502 
[30-015] 
29-2 10 
29-343 
[30-019] 
25 
29-538 
29-570 
29-860 
29-270 
29-320 
[29-736] 
29-938 
29-520 
30-100 
29-129 
29-395 
30-136 
26 
29-616 
[29-397] 
[29-683] 
29-298 
29-243 
29-742 
29-839 
29-625 
29-900 
29-257 
[29-438] 
30-102 
27 
29-372 
29-027 
29-800 
29-580 
29-141 
29-627 
29-725 
[29-633] 
29-603 
29-2S0 
29-0S7 
30121 
28 
29-260 
29-216 
29-774 
29-390 
[29-456 1 
29-525 
29-67S 
29-530 
29-638 
28-5S6 
29-643 
30-1S0 
29 
[29-340] 
29-822 
29-565 
29-710 
29-525 
29-237 
29-688 
29-679 
[29-192] 
29-967 
30-064 
30 
29-218 
29-436 
[29-751] 
29-770 
29-506 
[29-495] 
29-931 
29-500 
29-256 
29-909 
29-769 
31 
28-316 
29-063 
29-546 
29-564 
29-956 
29-259 
[29-683] 
Mean 
29-358 
29-498 
29-661 
29-48S 
29-622 
29-620 
29-637 
29-656 
29-935 
29-404 
I 29-475 
29-963 
