Recent Auroral Displays. 133 
‘‘below its mean value, and during the afternoon a rapid 
“yecovery commenced between Oh. 38’ p.m. and 4 p.m. 
‘“(Hastern time), an increase of .0096 C. G.3. took place ; 
“the total change of horizontal force during the disturb- 
“ance was over .0148 C.G.S. Between 6 and 9 p.m. the 
“vibrations were very swift. The changes in the vertical 
““component were also considerable.”* 
This magnetic storm was preceded by a most unusual 
outbreak of sun spots. The group of spots which became 
visible by rotation on Feb. 5th was, on the morning of the 
8th, and for some days thereafter, easily visible to the 
naked eye. The area of the group, as measured here on 
the 8th, amounted in area to about ;4,th of the sun’s 
visible hemisphere, the length of the disturbed area being 
about 149,000 and the breadth about 100,000 miles. On 
Feb. 13th there was also another very large group of spots, 
then about making good its position on the eastern limit, 
which added very materially to the total spotted area on 
this day. This latter is probably the same group of spots 
which, after making one rotation, is now (March 14th) 
nearly central on the sun. 
THE NickeL DEPosITts OF SCANDINAVIA. 
By Pror. J. H. L. Voer, of the University of Christiania. 
Prof. J. H. L. Vogt, of the University of Christinia, who 
is engaged in preparing a work on the nickel deposits of 
Scandinavia, hasina letter to Dr. A. R. C. Selwyn, Director 
of the Geological Survey of Canada, dated January 4, 1892, 
given some interesting facts concerning these deposits. 
As these-Scandinavian deposits are of especial interest 
to Canadians, since they resemble in many ways the 
great deposits occurring in the vicinity of Sudbury,f Dr. 
Selwyn has placed the letter in the hands of the Hditing 
Committee of the Recorp or Science, and from it the fol- 
lowing facts have been gathered. F.D.A. 
* From a statement kindly furnished by Mr. C. Carpmael. 
t See paper ‘“‘ On the Nickel and Copper Deposits of Sudbury, Ont.’ by Alfred 
E. Barlow, Can. Ree. of Sci. Vol. 5, Number 1, p. 68. 
° 
