If we except that part of the Kara Sea which has been surveyed by the two last Swedish expeditions, we have for the present no knowledge of the vegetable and animal life in the sea which washes the north coast of Siberia. Quite certainly we shall here, in opposition to what has been hitherto supposed, meet with the same abundance of animals and plants as in the sea round Spitzbergen. In the Siberian Polar sea, the animal and vegetable types, so far as we can judge beforehand, exclusively consist of survivals from the glacial period, which next preceded the present, which is not the case in the Polar Sea, where the Gulf Stream distributes its waters, and whither it thus carries types from more southerly regions. But a complete and exact knowledge of which animal types are of glacial, and which of Atlantic origin, is of the greatest importance, not only for zoology and the geography of animals, but also for the geology of Scandinavia, and especially for the knowledge of our loose earthy layers.
Few scientific discoveries have so powerfully captivated the interest, both of the learned and unlearned, as that of the colossal remains of elephants, sometimes well preserved, with flesh and hair, in the frozen soil of Siberia. Such discoveries have more than once formed the object of scientific expeditions, and careful researches by eminent men; but there is still much that is enigmatical with respect to a number of circumstances connected with the mammoth period of Siberia, which _perhaps_ was contemporaneous with our glacial period. Specially is our knowledge of the animal and vegetable types, which lived contemporaneously with the mammoth, exceedingly incomplete, although we know that in the northernmost parts of Siberia, which are also most inaccessible from land, there are small hills covered with the bones of the mammoth and other contemporaneous animals, and that there is found everywhere in that region so-called Noah's wood, that is to say, half-petrified or carbonised vegetable remains from several different geological periods.
Taking a general view of the subject, we see that an investigation, as complete as possibly, of the geology of the Polar countries, so difficult of access, is a condition indispensable to a knowledge of the former history of our globe. In order to prove this I need only point to the epoch-making influence which has been exerted on geological theories by the discovery, in the rocks and earthy layers of the Polar countries, of beautiful fossil plants from widely separated geological periods. In this field too our expedition to the north coast of Siberia ought to expect to reap abundant harvests. There are besides to be found in Siberia, strata which have been deposited almost contemporaneously with the coal-bearing formations of South Sweden, and which therefore contain animal and vegetable petrifications which just now are of very special interest for geological science in our own country, with reference to the discoveries of splendid fossil plants which of late years have been made at several places among us, and give us so lively an idea of the sub-tropical vegetation which in former times covered the Scandinavian peninsula.