276 ABSTRACTS OF THE MAKERSTOUN OBSERVATIONS, 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 before the 
maximum temperature in Summer and Winter. In the mean for the year, the minimum humidity occurs 
about 20™ after the maximum temperature, and about 50™ 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 i 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 pee for the ca occurs at A 28™ a.m. 
SA Shooderaccooce SD AEA 40™ p.m, 
The interval between these periods is, 10" 12™ 
Diurnal Range of Humicdity—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. 
Feb. March. il. May. June. July. o = . Nov. 
in. in. in. in. in. in. in. in. in. in. 
29-256 | 29-630 ‘ 30-184 | 29.335 | 29.558 Fi 30-059 |[29-677]| 29-515 
29-093 | 29-881 : 30-070 | 29-055 |[ 29-530) : 30-078 | 29-700 | 29-645 
28-914 | 30-015 . 29-717 | 26-189 | 29-471 : [30-060] 29-780 | 29-358 
29-469 | 30-108 : 29-399 |[29-400)| 29-661 : 30-075 | 29-767 | 29-328 
[29-559 )|[30-008) “ 29-270 | 29-682 | 29.458 . 30-146 | 29-684 |[29-385] 
29-856 | 29-929 : 29-272 | 29-693 | 29-379 |[29- 30-046 | 29-204 | 29-424 
30-026 | 29.991 050 |[29-544)) 29-449 | 29-579 826 | 30-042 | 29-056 | 29.232 
]| 29-997 | 30-125 : 29-585 | 28-848 | 29-695 Be 30-032 |[29-295]) 29-325 
29-987 | 30-098 -429)| 29-756 | 28-838 |[29-734) : 29-962 | 29.337 | 29-585 
29-978 | 29-806 . 29-982 | 29-429 | 29-864 | 29-926 |[29-997]| 29.537 | 29-323 
30-007 | 29-847 | 29.7 29-976 |[29-502]| 29-999 | 29- 29-823 | 28-952 | 29-838 
[29-757 ]|[29-623} 29-62 29-796 | 29-983 | 29-891 p 30-111 | 29-060 |[29-770] 
29.777 | 29-218 ‘ 29-498 | 29-956 | 29-841 : 30-011 | 29-290 | 29-957 
29-550 29-196 | 29-473 |[29-614]} 29-961 | 29-805 : 29-788 | 29-544 | 30-080 
]} 29-242 | 29.572 | Qe. 29-401 | 29-975 | 29-739 “Be 29-746 |[29-409]) 29-836 
29-107 | 29-722 . 29-397 | 29-916 |[29-699) : 29-781 | 29-368 | 29-800 
29-420 | 29.520 . 29-618 | 29-884 | 29-848 : [29-837]| 29.371 | 29-384 
29-550 | 29-665 | 29.7 29-830 |(29-877 || 29-506 -875 | 29-818 | 29-824 | 29.073 
[29-340]|[29-473]] 29-679 | 29-856 | 29-839 | 29.454 | 29. 30-044 | 30-105 |[29-226] 
29-327 | 29-550 B 29-749 | 29-911 | 29-317 |(29-567]) 29-844 | 29.803 | 29.094 
| 29-325 | 29-219 | 29. |[29-690)| 29-738 | 29-360 | 29- 29-924 | 29.602 | 29.042 
| 29-310 | 29-163 +04 29-555 | 29-809 | 29-362 | 29- 30-238 |[29.564] 28-963 
| 29-390 | 29-250 |[29-4 | 29-601 | 29-852 |[29-601] . 30-323 | 29-503 | 29-192 
29-551 | 29-594 | 29-775 | 29-549 | 29.862 | 29-793 | 29-5 (30:015]}) 29-240 | 29.343 
| 29-570 | 29-860 | 29-270 | 29-320 [29-736] 29-938 3) 30-100 | 29-129 | 29.395 
[29-397 ]|[29.683]] 29. 29-243 | 29-742 | 29-839 29-900 | 29-257 |[ 29-438] 
29-027 | 29-800 | 29- | 29-141 | 29-627 | 29-725 | 29-603 29-280 | 29-087 
| 29-216 | 29.774 | 29. [29-456]| 29-525 | 29-678 | 29-638 | 28-586 | 29.643 
{29-340} 29-822 | 29- | 29-710 | 29-525 | 29-237 | 2 29-679 |[29-192]) 29-967 
29-218 29-436 |(29-751]) 29-776 | 29-506 |[29-495]| 29- 29-500 | 29.256 | 29-909 
28-316 29-063 29-546 29-564 . 29-259 
WCOANOUPRWN 
et. _ \ 9 ea a me = ——— = 
29-358 -498 | 29-661 | 29-488 | 29-622 | 29-620 | 29-637 H 29-935 | 29.404 | 29-475 | 29-963 
