The Voyage of the Vega round Asia and Europe, Volume I and Volume II

by A. E. Nordenskiöld

for renewed investigations in the direction indicated, our involuntary rest at the drift-ice field offered.

Immediately after the Vega lay-to, I therefore went down on the ice in order to see whether here too some such metalliferous dust, as I had before found north of Spitzbergen, was not to be found on the surface of the ice. Nothing of the kind, however, was to be seen. On the other hand, Lieutenant Nordquist observed small yellow specks in the snow, which I asked him to collect and hand over for investigation to Dr. Kjellman. For I supposed that the specks consisted of diatom ooze. After examining them Dr. Kjellman however declared that they did not consist of any organic substance, but of crystallised grains of sand. I too now examined them more closely, but unfortunately not until the morning after we had left the ice-field, and then found that the supposed ooze consisted of pale yellow crystals (not fragments of crystals) without mixture of foreign matter. The quantity of crystals, which were obtained from about three litres of snow, skimmed from the surface of the snow on an area of at most 10 square metres, amounted to nearly 0.2 gram. The crystals were found only near the surface of the snow, not in the deeper layers. They were up to 1 mm. in diameter, had the appearance shown in the accompanying woodcut, and appeared to belong to the rhombic system, as they had one perfect cleavage and formed striated prisms terminated at either end by truncated pyramids. Unfortunately I could not make any actual measurements of them, because after being kept for some time in the air they weathered to a white non-crystalline powder. They lay, without being sensibly dissolved for a whole night in the water formed by the melting of the snow. On being heated, too, they fell asunder into a tasteless white powder. The white powder, that was formed by the weathering of the crystals, was analysed after our return—21 months after the discovery of the crystals—and was found to contain only carbonate of lime.

The original composition and origin of this substance appears to me exceedingly enigmatical. It was not common carbonate of lime, for the crystals were rhombohedral and did not show the cleavage of calcite. Nor can there be a question of its being arragonite, because this mineral might indeed fall asunder "of itself," but in that case the newly-formed powder ought to be crystalline. Have the crystals originally been a new hydrated carbonate of lime, formed by crystallising out of the sea-water in intense cold, and then losing its water at a temperature of 10° or 20° above the freezing-point? In such a case they ought not to have been found on the surface of the snow, but lower down on the surface of the ice. Or have they fallen down from the inter-planetary spaces to the surface of the earth, and before crumbling down have had a composition differing from terrestrial substances in the same way as various chemical compounds found in recent times in meteoric stones? The occurrence of the crystals in the uppermost layer of snow and their felling asunder in the air, tell in favour of this view. Unfortunately there is now no possibility of settling these questions, but at all events this discovery is a further incitement to those who travel in the High North to collect with extreme care, from snow-fields lying far from the ordinary routes of communication, all foreign substances, though apparently of trifling importance.

As this question can be answered with the greatest ease and certainty by investigations in the Polar regions, I shall here, for the guidance of future travellers, enumerate some discoveries of a like nature which have been made by me, or at my instance. 1. In the beginning of December, 1871, there happened at Stockholm an exceedingly heavy fall of snow, perhaps the heaviest which has taken place in the memory of man. Several persons perished in the snow in the immediate neighbourhood of Stockholm. During the last days of the snowfall I had about a cubic metre of snow collected and melted in a vessel. It left a residue of black powder, which contained grains of metallic iron that were attracted by the magnet.

2. In the middle of March, 1872, a similar investigation was made by my brother, KARL NORDENSKIÖLD, in a remote forest settlement, Evois, in Finland. Here, too, was obtained, on the melting of the snow, a small residuum, consisting of a black powder containing metallic iron.

3. On the 8th August and 2nd September of the same year, I examined, north of Spitzbergen, in 80° N.L., and 13° to 15° E.L., the layer of snow that there covered the ice. The nature of this layer is shown by the accompanying woodcut, in which 1, is new-fallen snow; 2, a layer of hardened old snow, eight mm. in thickness; 3, a layer of snow conglomerated to a crystalline granular mass; and 4, common granular hardened snow. Layer 3 was full of small black grains, among which were found numerous metallic particles that were attracted by the magnet, and were found to contain iron, cobalt, and possibly nickel also.

4. On the melting of 500 gram. hail, which fell in Stockholm in the autumn of 1873, similar metallic particles containing cobalt (nickel) were obtained, which, in this case, might possibly have come from the neighbouring roofs, because the hail was collected in a yard surrounded by houses roofed with sheet-iron painted red. The black colour of the metallic particles enclosed in the hail, their position in the hail, and finally, the cobalt they contained, however, indicate in this case too, a quite different origin.

5. In a dust (kryokonite), collected on the inland ice of Greenland in the month of July, 1870, there were also found mixed with it grains of metallic iron, containing cobalt. The main mass consisted of a crystalline, double-refracting silicate, drenched through with an ill-smelling organic substance. The dust was found in large quantities at the bottom of innumerable small holes in the surface of the inland ice. This dust could scarcely be of volcanic origin, because by its crystalline structure it differs completely from the glass-dust that is commonly thrown out of volcanoes, and is often carried by the wind to very remote regions, as also from the dust which, on the 30th March, 1875, fell at many places in the middle of Scandinavia, and which was proved to have been thrown out by volcanoes on Iceland. For, while kryokonite consists of small angular double-refracting crystal-fragments without any mixture of particles of glass, the volcanic Haga-dust[191] consists almost wholly of small microscopic glass bubbles that have no action on the polarisation-planes of the light that passes through them.