It is probable that towards the close of the sixteenth century the Russian hunting voyages to Novaya Zemlya had already fallen off considerably. The commercial voyages perhaps had long before altogether ceased. It appears as if after the complete conquest of Siberia the land route over the Ural mountains, formerly regarded with such superstitious feelings, was preferred to the unsafe sea route across the Kara Sea, and as if the Government even put obstacles in the way of the latter by setting watches at Matvejev Island and at Yugor Straits.[162] These were to receive payments from the hunters and merchants, and the regulations and exactions connected with this arrangement deprived the Polar Sea voyages of just that charm which had hitherto induced the bravest and hardiest of the population to devote themselves to the dangerous traffic to the Ob, and to the employment of hunting, in which they were exposed to so many dangers, and subject to so great privations. The circumstance to which we have referred may also be the reason why we do not know of a single voyage in this part of the Polar Sea during the period which elapsed from the voyage of Rodivan Ivanov to "the great Northern Expedition." It examined, among other parts of the widely extended north coast of the Russian empire, the southern portion also of the navigable waters here in question, in the years 1734, 35, under Muravjev and Paulov, and in 1736, 37 under Malygin, Skuratov, and Suchotin. Their main working field however did not lie here, but in Siberia itself; and I shall give an account of their voyages in the Kara Sea further on, when I come to treat of the development of our knowledge of the north coast of Asia. Here I will only state that they actually succeeded, after untold exertions, in penetrating from the White Sea to the Ob, and that the maps of the land between that river and the Petchora, which are still in use, are mainly grounded on the work of the great northern expedition, but that the bad repute of the Kara Sea also arose from the difficulties to which these explorers were exposed, difficulties owing in no small degree to the defective nature of the vessels, and a number of mistakes which were made in connection with their equipment, the choice of the time of sailing, &c. [Illustration: AMMONITE WITH GOLD LUSTRE. From Novaya Zemlya. _Ammonites alternans_. V. BUCH. ]