I ()();->. 



It i- at the four stations, Little Kannakiil, ('ape Tnordsen, Bossekop, and Jan Maven, tliat the storm 

 de\ (]( ipi-s to its greatest strength. 



If we look at the curves, \vc see that there are several peculiarities in this perturbation that are 

 \vorthv ol notii'e. 



In the lirst plaee, the maximum does not occur exactly simultaneously at these stations. 



At Little Karmakul and Jan Mayen it occurs almost simultaneously at 123 '' 25'" -30'", at anv rate if 

 \ve consider the conditions in the horizontal intcnsitv, where' the dellections are most characteristic. At 

 the two intermediate stations, on the other hand, the maximum does not occur until a little later, at 

 ~;V' -J l>! " 4r>'"- I'his circumstance is evidently to In- ascribed to a movement in, or of, the svstem of 

 precipitation. In the next place, the negative deflections in the horizontal intensity do not cease sinuil- 

 taneouslv either. At Little Karmakul the dellections decrease rather rapidlv, and even go over to the 

 other side at o 1 ' is"', so that after that time we find almost cxclnsivelv positive values of/', until about 

 2 1 ' ,-jo'", after which, for the rest of tin; period considered, the curve oscillates about the normal line, 

 but with very small deflections. 



Here then, the negative storm appeal's to be superseded by a positive storm at about o 1 ' 15'". 



At the three other stations, howi vcr, there is no indication of any positive storm. 



At Cape '1 hordscn, the conditions in the horizontal-intensity curve have once- more become normal 

 at about o 1 ' 50"'; at ISossckop anil Ian Mayen, on the other hand, this does not take place until about 

 r' 1 20"' -30'". 



It will be difficult to demonstrate anv single movement of the svstem of precipitation, by the differ- 

 ence in time between the various maxima of the negative dellections; but at the conclusion of the storm, 

 the conditions seem to be simpler. \Vc see that the storm lasts longer at the more westerly stations 

 than at those farther east. 



Iy east and west, here, must not be understood geographical east and west, but rather the direc- 

 tion, parallel with the auroral /one, and by north and south the directions perpendicular to it. If we 

 use the geographical east and west, C'ape '1 hordsen is ol course situated to the west of Bossekop; 

 whereas magnetically, it must be considered as lying to the east of that station. We saw too, that the 

 storm terminated earlier at Cape Thordscn than at ISossekop. 



This last tact also seems to indicate that the system of precipitation is moving westwards, more or 

 less parallel with, or along, the auroral zone. 



In the declination too, there are quite considerable perturbing forces; but the curves here have 

 sometimes rather a disturbed character, in contrast to those of the horixontal intensity. 



It is, as we have said, principally at the- four stations mentioned above, that the perturbation especi- 

 ally asserts itself; although distinct effects of the system of precipitation are found also at Kingua Fjord 

 and (iodthaab. The conditions at the last-named station are moreover of peculiar interest, as at about 

 i h there is a strong, well-dctincd deflection there in the horixontal intensity curve. At that hour we do 

 not find deflections at an}' of the- other stations, which might indicate anv special connection with this 

 deflection, and thus this storm appears to be very local. 



As regards the American stations, we find at Fort Kae distinct signs of a positive polar storm. 1 he 

 greatest deflections are at about 3'', at which hour there is also a distinct deflection in the other elements. 



At Kingua fjord and I'glaamie, there are also deflections at the same hour, which might be the 

 effects ol a positive system of precipitation, but they are quite small. 



We have then, on this day, once more two systems of precipitation, a negative and a positive-. 

 Of these the lirst is the stronger, and it appears on the night-side of the- globe. The positive system 

 appears to be considerablv weaker, judging from the observations we have at our disposal, and it appears 

 upon the afternoon-side of the earth. 



