with the tedious preliminaries in fixing the magnetic instruments, prevented these officers from carrying out their labours regularly till the next month. The following are the principal results of these observations: (1) The magnetic disturbances were of extraordinary magnitude and frequency. (2) They were closely connected with the aurora; and they were greater as the motion of the rays was more rapid and fitful, and the prismatic colours more intense. Quiescent and regular arches, without changing rays or streamers, exercise almost no influence on the needle. (3) In all the disturbances the declination needle moved towards the east, and the horizontal intensity decreased while the inclination increased. 6. In spite of the extreme difficulty of describing the appearances of those fitful and changing lights, I believe that the following description of Lieutenant Weyprecht will be found equally faithful and effective:— “There in the south, low on the horizon, stands a faint arch of light. It looks as it were the upper limit of a dark segment of a circle; but the stars which shine through it in undiminished brilliancy convince us that the darkness of the segment is a delusion produced by contrast. Gradually the arch of light grows in intensity and rises to the zenith. It is perfectly regular; its two ends almost touch the horizon and advance to the east and west in proportion as the arch rises. No beams are to be discovered in it, but the whole consists of an almost uniform light of a delicious tender colour. It is transparent white with a shade of light green, not unlike the pale green of a young plant which germinates in the dark. The light of the moon appears yellow, contrasted with this tender colour so pleasing to the eye, and so indescribable in words, a colour which nature appears to have given only to the Polar regions by way of compensation. The arch is broad, thrice the breadth, perhaps, of the rainbow, and its distinctly marked edges are strongly defined on the profound darkness of the Arctic heavens. The stars shine through it with undiminished brilliancy. The arch mounts higher and higher. An air of repose seems spread over the whole phenomenon; here and there only a wave of light rolls slowly from one side to the other. It begins to grow clear over the ice; some of its groups are discernible. The arch is still distant from the zenith; a second detaches itself from the dark segment, and this is gradually succeeded by others. All now rise towards the zenith; the first passes beyond it, then sinks slowly towards the northern horizon and as it sinks loses its intensity. Arches of light are now stretched over the whole heavens; seven are apparent at the same time on the sky, though of inferior intensity. The lower they sink towards the north, the paler they grow, till at last they utterly fade away. Often they all return over the zenith, and become extinct, just as they came.