TRANSACTIONS OF THE SECTIONS. 
39 
The dews are frequently very heavy at this season, so much so that the quantity 
precipitated in one night in the rain-gauge has often measured the one or two thou- 
undth part of an inch. . . 
The mean height of the barometer, as deduced from the observations taken during 
[wiuil of ten years, is 2971377 ins. at un altitude of 120 feet above the level of 
tk*ta. 
In a general Table* were exhibited the greatest and leftist elevations of the baro- 
fcrtci m each month for the ten years 18-13 to 1852. To the maximum heights of 
: h u-ar was annexed the mark X and to the minimum 0. Of the yearly maxima, 
< greatest (lumber, or one-half, occur in the first two months, and the rest ut the 
■ i A the year, with one exception in April. Six of the yearly minima occur in the 
f' two mouths of the year ; the other four minima occur in the beginning of the 
f. Tima there are five months (May to September) iu which the barometer visits 
t '^r extreme of its yearly variation, while the higher and lower annual extremes 
»t chiefly dm product of what constitutes the winter at this station. 
Another Table*, drawn from the results of the preceding one, serves for more easy 
'•titicc The average of the third column, or the medium between the average 
and depressions, is seven hundredths of an inch below the mean height 
‘ ‘i" 1 dimate (29 71377 ins.), the reason of which is that the depressions occupy 
ler space of time than the elevations; inconsequence, a less proportion of 
"'T? cumes into an average founded on daily results. 
* avorage annual range U 1*944 in.; the range varies in different years about 
-tenths of na inch. 
, n. 8 ^Yatibtt > Q ten years appears to have been 30757 ins. " corrected” 
| 7th February 1849; the day was introduced by a moderate N.N.E. breeze, 
'- -J!;ij 1 -T 1 fog ia tlie mo » ning ; the temperature was i° below zero during the 
ads'f’ 111 u s *' J °d nt 35° at. noon; the day was very fiuc, with a few cirrus 
■V,l*i(u < j T> l Wes t - ^'* le liext h‘S^ p 3t was 30 763 ins. "corrected” on the 2nd 
’ when the wind had also prevailed for three days from the N.E., but 
. IK..,,, 1 |? m , tbe smith at the time of the extreme runge. The temperature had 
. ■' 'o. iu, , UW T 3 ° helow zero on the night preceding the 1st, and 2° below 
• l„, •»„.? p' the tomperaturt* was only 23° at noun on the 1st, and 32’ at noon 
iQ'i on th-'o ,”8 at Bunrian on tho 1st; cirrus clouds from S.W. ou both days, 
The h , a '° rou,ul b ' J th the sun and moon. , , 
1 " Ur d. K d fPf® S8,on in ten years occurred on 3rd November 1851, when the 
„n?!i T t0 28 ' 505 in 3- at 12 f.m. ; there was fog in the evening, with 
1 ‘ .tiir,.\vi" 1 R 1 0 1 at 10 P,M *« the wind was u fresh breeze from the S.W.; the 
m.Uje, ut , out of doors at 9 r.jt. Howard’s observation in England, that 
' ‘ u knotv,. t ' G ls Produced. very suddenly, is not borne out here; it has often 
r " hive rf* 8e ° l ^ nbout an inch within twenty-four hours, mid the two 
i«,o .Li rred wit h‘m a few days of each other; while in February and 
T ’ly. _ r |-r ‘ aro| neter never fell below 30 ins. for seventeen days iu succession. 
Tn- »ii T - a g ®,® n annuiil depth of ruin is 44 , 9t576 ins. for ten years ; the greatest 
>‘-ar following 115 ’ , In 8 »» ISIS, and the least quantity, 32-921 ins., being in 
^"trxrv t q g ‘ ° r 184 0- 
‘•; r| *arm and ab8em 'd connexion in England between a wet and cold season, 
latest nr.'/ 8Uc h affinity appears to connect them at this station; 
f “ above it,!! T l° f ra in ,e, l in 1848, when the mean temperature was 43 -2, 
4l - wlillB tbo cb-ioat vear was IS49, when the mean tempera- 
„ l 1 '-latest,?! 8 bclow the mean. 
i.^e least qu-.,*! 11 ! lull in any one month was 10*58 ins. in October 1843, 
■ in May 1840. 
jrr «:ttH>. s r . ,ne g^atest quantity falls in the month of October, confirming 
1 f util ‘he hrooU al A !f rVatlona of tllG Indians, who say that the frost never sets 
t, „ ,rjft an averai;e h ast quantity of rain falls in the month of June. 
t * 5 during the ni .hr' 08 ° Q d (l y s iu each year, and twice as often in the day- 
Thjgg ^ * 
• u in clte, aUvp 0 !i P "*'* isllt, 'd *'< the present Report. 
l!b0Te th» average * 6 avora 8 e falling in the first quarter, when the mean temperature 
