138 Scientific Intelligence. 
The least degree of humidity was 22, the point of saturation being 
represented by 100. 
The following is the mean result of the barometric observations for 
ive years. 
jGa.m. | 8 | 10. jnoon./2pmj 4 | 6. | 8 | 10. |midnight2a.m) 4 | 
ooweeg ih 375 ell -303} 310} -311 226 sil -357| -361 tigi 370) 
eo nl +241) -259} -271 ve ‘285| -279| -269| -256) -250| +243 | -238) -234 
sure, 29-620) -634| -635! +614) -595| -590| -595} -604| -607) -604 | -602) -604 
The diurnal pressure of the gaseous atmosphere has one maximum 
which occurs about the coldest hour of the day, and one minimum 
which occurs about the warmest hour of the day. The elastic force 
of the vapor has also one maximum which occurs at 2 Pp. M. and one 
minimum at4 a.m. The sum of these two pressures however ex- 
hibits two daily maxima, viz. at 10 a. Mm. and p. m.; and two daily mini- 
ma, viz. about 3 or 4.4. m. and p.m. Thus this knotty question re- 
specting the diurnal oscillations of the barometer has been beautifully 
resolved by simply interrogating nature. 
The pressure of the wind resolved in the direction of the four cardi-— 
nal sg was as — 
E. 8. w. 
1841, 1832-6 Ibs. 957-2 TAT4 1741-4 
1842, 25444 1386°2 1293°3 2697°4 © 
The mean direction of the wind is accordingly N. 41° 53’ W. The 
greatest pressure observed during the two years was 15 pounds per 
square foot, Feb. 1 
— amount of rain in 1841, was. : 36°58 inches. 
“ce “c 1842, oe fg 42°80 ac 
(2.) Observations in Magnetism and Meteorology, made at Makers- 
toun, Scotland, in the Observatory of Sir 'T. M. Brispane, 1841 and 
1842, 
These are the fruits of a private observatory established by General 
BrisBane in concert with those which were endowed by the govern- 
ments of Europe. The observatory is situated in latitude 55° 34’ 45” 
N., longitude 04 10™ 35-5 W, 
According to these observations, the mean declination in 1842 was 
° 2856 W. Yearly decrease of west declination, 4’-07. 
Greatest declination observed, . : or... 1 
Least = me : ; 24° 5428 
_ Range in 17 monthej cwissigiad ql: Te, Q° 7-28 
- magnetic * for 1842, 71° 1195. Yearly decrease of dip, 
