M. de Tessan, who, in the voyage of the "Venus" around the world, had the opportunity of seeing a very beautiful aurora australis, (southern aurora,) which he describes with much care, also considers that this phenomenon takes place in the atmosphere. The summit of the aurora being in the magnetic meridian, it was elevated 14° above the horizon, and the centre of the arc was on the prolongation of the dipping needle, the dip being about 68° at the place of the observation. M. de Tessan did not hear the noise arising from the aurora, which he attributes to the circumstance that he was too far distant from the place of the phenomenon; but he reports the observation of a distinguished officer of the French navy, M. Verdier, who, on the night of October 13th, 1819, being in the latitude of Newfoundland, had heard very distinctly a sort of crackling or crepitation, when the vessel he was on board was in the midst of an aurora borealis. This was also observed in many localities during the aurora of August 28th, 1859. A New York paper, alluding to the subject, remarks: "Many imagined that they heard rushing sounds, as if Aeolus had let loose the winds; others were confident that a sweeping, as if of flames, was distinctly audible." Burns, a good observer, if ever there was one, and not likely to be aware of any theories on the subject, alludes in his "Vision" to a noise accompanying the aurora, as if it were of ordinary occurrence:—

"The cauld blue North was flashing forth
Her lights wi' hissing eerie din."

It finds confirmation also in the fact, generally admitted by the inhabitants of the northern regions, that, when the auroras appear low, a crackling is heard similar to that of the electric spark. The Greenlanders think that the souls of the dead are then striking against each other in the air. M. Ramm, Inspector of Forests in Norway, wrote to M. Hansteen, in 1825, that he had heard the noise, which always coincided with the appearance of the luminous jets, when, being only ten years old, he was crossing a meadow covered with snow and hoar-frost, near which no forests were in existence. Dr. Gisler, who for a long time dwelt in the North of Sweden, remarks that the matter of the aurorae boreales sometimes descends so low that it touches the ground; at the summit of high mountains it produces upon the faces of travellers an effect analogous to that of the wind. Dr. Gisler adds, that he has frequently heard the noise of the aurora, and that it resembles that of a strong wind, or the hissing that certain chemical substances produce in the act of decomposition.

M. Necker, who has described a great number of aurorae which he observed at the end of 1839 and at the commencement of 1840, in the Isle of Skye, never himself heard the noise in question; but he remarks that this noise had been very frequently heard by persons charged with meteorological observations at the light-house of Swenburgh Head, at the southern extremity of Shetland. M. Necker is not the only observer who has not heard the noise; neither have MM. Lottier and Bravais, who have observed so great a number of aurorae, ever heard it; and a great many others are in this case. This may be due to the fact that it is necessary to be very near to the aurora in order to hear the crepitation in question, and also to the fact that it is possible that it does not always take place, at least in a manner sufficiently powerful to be heard.

We have just been pointing out, as concomitant effects of the aurora borealis, a noise of crepitation analogous to that of distant discharges, and a sulphurous odor similar to that which accompanies the fall of lightning. M. Matteucci also observed at Pisa, during the appearance of a brilliant aurora borealis, decided signs of positive electricity in the air; but of all phenomena, those which invariably take place at the same time as the appearance of the aurora borealis are the magnetic effects. Magnetized needles suffer disturbances in their normal direction which cause them to deviate generally to the west first, afterwards to the east. These disturbances vary in intensify, but they never fail to take place, and are manifested even in places in which the aurora borealis is not visible. This coincidence, proved by M. Arago without any exception, during several years of observation, is such that the learned Frenchman was able, without ever having been mistaken, to detect from the bottom of the cellars of the observatory of Paris the appearance of an aurora borealis. M. Matteucci had the opportunity of observing this magnetic influence under a new and remarkable form. He saw, during the appearance of the aurora borealis of November 17, 1848, the soft iron armatures employed in the electric telegraph between Florence and Pisa remain attached to their electro-magnets, as if the latter were powerfully magnetized, without, however, the apparatus being in action, and without the currents in the battery being set in action. This singular effect ceases with the aurora, and the telegraph, as well as the batteries, could operate anew, without having suffered any alteration. Mr. Highton also observed in England a very decided action of the aurora borealis, November 17, 1848. The magnetized needle was always driven toward the same side, even with much force. But it is in our own country that the action of the aurora upon the telegraph-wires has been the most remarkable.

My attention was first called in 1847 to the probability of the aurora's producing an effect upon the wires; but, although having an excellent opportunity to observe such an effect, I was not fortunate enough to do so until the winter of 1850, and then, owing to the feeble displays of the aurora, only to a limited extent. In September, 1851, however, there was a remarkable aurora, which took complete possession of all the telegraph-lines in New England and prevented any business from being transacted during its continuance. The following winter there was another remarkable display, which occurred on the 19th of February, 1852. It was exceedingly brilliant throughout the northern portion of our continent. I extract the following account of its effects upon the wires from my journal of that date. I should premise, that the system of telegraphing used upon the wires, during the observation of February, 1852, was Bain's chemical. No batteries were kept constantly upon the line, as in the Morse and other magnetic systems. The main wire was connected directly with the chemically prepared paper on the disc, so that any atmospheric currents were recorded upon the disc with the greatest accuracy. Our usual battery current, decomposing the salts in the paper, and uniting with the iron point of the pen wire, left a light blue mark on the white paper, or, if the current were strong, a dark one,—the color of the mark depending upon the quantity of the current upon the wire.

"Thursday, February 19, 1852.

"Towards evening a heavy blue line appeared upon the paper, which gradually increased in size for the space of half a minute, when a flame of fire succeeded to the blue line, of sufficient intensity to burn through a dozen thicknesses of the moistened paper. The current then subsided as gradually as it, had come on, until it entirely ceased, and was then succeeded by a negative current (which bleaches, instead of coloring, the paper). This gradually increased, in the same manner as the positive current, until it also, in turn, produced its flame of fire, and burned through many thicknesses of the prepared paper; it then subsided, again to be followed by the positive current. This state of things continued during the entire evening, and effectually prevented any business being done over the wires."

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Never, however, since the establishment of the telegraphic system in this country, have the wires been so greatly affected by the aurora as upon Sunday night, the 28th of August, 1859. Throughout the entire northern portion of the United States and Canada, the lines were rendered useless for all business purposes through its action. So strongly was the atmosphere charged with the electric fluid, that lines or circuits of only twelve miles in length were so seriously affected by it as to render operation difficult, and, at times, impossible.