If the interpretation of an obscure passage in Pliny be correct, mammoth ivory has, from the most ancient times, formed a valued article of commerce, which, however, was often mistaken for the ivory of living elephants and of the walrus. But portions of the skeleton of the mammoth itself are first described in detail by WITSEN, who during his stay in Russia in 1686 collected a large number of statements regarding it, and at least in the second edition of his work gives good drawings of the under jaw of a mammoth and the cranium of a fossil species of ox, whose bones are found along with the remains of the mammoth (WITSEN, 2nd. edit. p. 746). But it appears to have escaped Witsen, who himself considered mammoth bones to be the remains of ancient elephants, and who well knew the walrus, that in a number of the accounts which he quotes, the mammoth and the walrus are clearly mixed up together, which is not so wonderful, as both are found on the coast of the Polar Sea, and both yielded ivory to the stocks of the Siberian merchants. In the same way all the statements which the French Jesuit, AVRIL, during his stay in Moscow in 1686, collected regarding the amphibious animal, _Behemoth_, occurring on the coast of the Tartarian Sea, (Polar Sea) refer not to the mammoth, as some writers, HOWORTH[215] for example, have supposed, but to the walrus. The name mammoth, which is probably of Tartar origin, Witsen appears to wish to derive from Behemoth, spoken of in the fortieth chapter of the Book of Job. The first mammoth tusk was brought to England in 1611, by JOSIAS LOGAN. It was purchased in the region of the Petchora, and attracted great attention, as appears from Logan's remark in a letter to Hakluyt, that one would not have dreamed to find such wares in the region of the Petchora (_Purchas_, iii p. 546). As Englishmen at that time visited Moscow frequently, and for long periods, this remark appears to indicate that fossil ivory first became known in the capital of Russia some time after the conquest of Siberia. [Illustration: MAMMOTH SKELETON IN THE IMPERIAL MUSEUM OF THE ACADEMY OF SCIENCES IN ST PETERSBURG. After a Photograph communicated by the Academician Friedrich Schmidt in St. Petersburg. ] [Illustration: RESTORED FORM OF THE MAMMOTH After JUKES, _The Student's Manual of Geology_, Edinburgh, 1862. ]