Pöppig[12] says the average yield of a Cocal or Coca plantation is about 800 lbs. of dry leaves per English acre. When nearly dry, he says, they emit an odour similar to mellilot, or the new-mown hay odour of _Anthoxanthum odoratum_ (probably due to coumarin), which causes headache to strangers. If not perfectly dry when packed they heat and ferment, and become inert and useless, especially to the manufacturer of Cocaine. [Footnote 12: Companion to _Bot. Mag._, 1835, i. 161, translated from “Reise im Chile, Peru und auf dem Amazon Ström, 1827 to 1832.”] Both Pöppig and Von Tschudi give a doleful account of the intemperate use of Coca by the inveterate _coquero_, as he is called,—his bad breath, pale lips and gums, greenish and stumpy teeth, and an ugly black mark at the angles of his mouth, his unsteady gait, yellow skin, dim and sunken eyes encircled by a purple ring, his quivering lips, and his general apathy—all bear evidence of the baneful effects of the Coca when taken in excess. He prefers solitude, and, when a slave to his cravings, he will often take himself for days together to the silence of the woods to indulge unrestrained the use of the leaf. The habit must be very seducing, as, though long stigmatised and very generally considered as a degrading, purely Indian vice, many white Peruvians at Lima and elsewhere retire daily at stated times to chew Coca. Even Europeans, Von Tschudi says, have fallen into the habit. Both he and Pöppig mention instances of white _coqueros_ of good Peruvian families who were addicted to the vice. One is described by Pöppig who became averse to any exertion; city life and its restraints were hateful to him; he lived in a miserable hut; once a month, at least, when irresistibly seized with the passion he would disappear into the forest and be lost for many days, after which he would emerge sick, powerless, and altered.