Of all the mineral products, none is more abundant than salt. On the side of the desert, and again near Tabriz at the mouth of the Aji Su, are vast plains which glisten with the substance, and yield it readily to all who care to gather it up. Saline springs and streams are also numerous, from which salt can be obtained by evaporation. But, besides these sources of supply, rock salt is found in places, and this is largely quarried, and is preferred by the natives. Other important products of the earth are saltpetre, which is found in the Elburz, and in Azerbijan; sulphur, which abounds in the same regions, and likewise on the high plateau; alum, which is quarried near Tabriz; naphtha and gypsum, which are found in Kurdistan; and talc, which exists in the mountains near Koum, in the vicinity of Tabriz, and probably in other places. The chief wild animals which have been observed within the limits of the ancient Media are the lion, the tiger, the leopard, the bear, the beaver, the jackal, the wolf, the wild ass, the ibex or wild goat, the wild sheep, the stag, the antelope, the wild boar, the fox, the hare, the rabbit, the ferret, the rat, the jerboa, the porcupine, the mole, and the marmot. The lion and tiger are exceedingly rare; they seem to be found only in Azerbijan, and we may perhaps best account for their presence there by considering that a few of these animals occasionally stray out of Mazanderan, which is their only proper locality in this part of Asia. Of all the beasts, the most abundant are the stag and the wild goat, which are numerous in the Elburz, and in parts of Azerbijan, the wild boar, which abounds both in Azerbijan, and in the country about Hamadan, and the jackal, which is found everywhere. Bears flourish in Zagros, antelopes in Azerbijan, in the Elburz, and on the plains near Sultaniyeh. The wild ass is found only in the desert parts of the high plateau; the beaver only in Lake Zeribar, near Sulefmaniyeh. The Iranian wild ass differs in some respects from the Mesopotamian. His skin is smooth, like that of a deer, and of a reddish color, the belly and hinder parts partaking of a silvery gray; his head and ears are large and somewhat clumsy; but his neck is fine, and his legs are beautifully slender. His mane is short and black, and he has a black tuft at the end of his tail, but no dark line runs along his back or crosses his shoulders. The Persians call him the _gur-khur_, and chase him with occasional success, regarding his flesh as a great delicacy. He appears to be the _Asinus onager_ of naturalists, a distinct species from the _Asinus hemippus_ of Mesopotamia, and the _Asinus hemionus_ of Thibet and Tartary.