Another product whereto Media gave name, and probably with more reason, was a kind of clover or lucerne, which was said to have been introduced into Greece by the Persians in the reign of Darius, and which was afterwards cultivated largely in Italy.  Strabo considers this plant to have been the chief food of the Median horses, while Dioscorides assigns it certain medicinal qualities.  Clover is still cultivated, in the Elburz region, but horses are now fed almost entirely on straw and barley.

Media was also famous for its silphium, or assafoetida, a plant which the country still produces, though not in any large quantity.  No drug was in higher repute with the ancients for medicinal purposes; and though the Median variety was a coarse kind, inferior in repute, not only to the Cyrenaic, but also to the Parthian and the Syrian, it seems to have been exported both to Greece and Borne, and to have been largely used by druggists, however little esteemed by physicians.

The other vegetable products which Media furnished, or was believed to furnish, to the ancient world, were bdellium, amomum, cardamomum, gum tragacanth, wild-vine oil, and sagaponum, or the Ferula persica.  Of these, gum tragacanth is still largely produced, and is an important article of commerce.  Wild vines abound in Zagros and Elburz, but no oil is at present made from them.  Bdellium, if it is benzoin, amomum, and cardamomum were perhaps rather imported through Media than the actual produce of the country, which is too cold in the winter to grow any good spices.

The mineral products of Media noted by the ancient writers are nitre, salt, and certain gems, as emeralds, lapis lazuli, and the following obscurer kinds, the zathene, the gassinades, and the narcissitis.  The nitre of Media is noticed by Pliny, who says it was procured in small quantities, and was called “halmyraga.”  It was found in certain dry-looking glens, where the ground was white with it, and was obtained there purer than in other places.  Saltpetre is still derived from the Elburz range, and also from Azerbijan.

The salt of Lake Urumiyeh is mentioned by Strabo, who says that it forms naturally on the surface, which would imply a far more complete saturation of the water than at present exists, even in the driest seasons.  The gems above mentioned are assigned to Media chiefly by Pliny.  The Median emeralds, according to him, were of the largest size; they varied considerably, sometimes approaching to the character of the sapphire, in which case they were apt to be veiny, and to have flaws in them.  They were far less esteemed than the emeralds of many other countries.  The Median lapis lazuli, on the other hand, was the best of its kind.  It was of three colors—­light blue, dark blue, and purple.  The golden specks, however, with which it was sprinkled—­really spots of yellow pyrites—­rendered it useless to the gem-engravers of Pliny’s time.  The zathene, the gassinades, and the narcissitis were gems of inferior value.  As they have not yet been identified with any known species, it will be unnecessary to prolong the present chapter by a consideration of them.