ee on ene SS kre eee ACTON GT ote tae © re 
Miscellaneous Intelligence. 445 
of Munich.* According to this astronomer, since August, 1840, the 
mean annual amplitude of the diurnal variation of magnetic declination 
between 8 a. m. and 1 P. m. augments regularly for Jive years and then 
diminishes for five years. The epoch of the minimum of this ampli- 
mum, to the middle of 1848. He has also found, from the Gottingen 
_ observations a maximum in 1837, corresponding.with the above observa- 
tions on the spots. 
The results of Dr. Lamont have been confirmed by M. Reslhuber at 
the Observatory of Kremsmiinster in Austria. ‘Thus in 1843, the an-. 
nual mean diurnal variations of declination and intensity have been 
0-00 
respectively 6/ 28-6 and 88; and in 1844 they were 6’ 14’-9 
and + 0:00138. In 1848, they were 10’ 55-4 and +0-00273; in 
1849, 10’ 39-5 and 0-00230. 
M. Schwabe has deduced from eight observations with regard to the 
period of rotation of the sun, 25-07 days as the shortest, 25°75 as the 
longest ; the mean of his results gives 25-507 days, He remarks that 
was reddish-brown, more red than brown. The next day it had much 
changed and the border had the usual gray color. 
M. Rodolphe Wolf, of Berne, has been registering the spots since 
1847; and he concludes that the number through a year so varies, that 
ze 
he middle of a large tree, small cry 
longed cold had extracted from the - at iher 
. . Ss 
a cold but little intense, 
of several trees which 
the buds of many trees, 
are in winter often penetrate 
: ie Gautier afterwards observes, is mentioned by Sabine as 
a “e. eon the 5 tions made at Hobarton from 1841 to 1848. 
Sxconp Szams, Vol. XIV, No. 42.—Nov., 1852. 51 
and the leaves of the plants of our country 
d beyond doubt with a cold several degrees 
