Carl Scherzer, who brought the supplies to Europe from which Niemann and Lossen, under Wöhler, first isolated Cocaine, narrates the following:[16]— [Footnote 16: “The Voyage of the Novara,” by Carl Scherzer, vol. iii. p. 402, London, 1863.] “A Scotchman named Campbell, who was settled as a merchant at Tacna in Bolivia, and with whom I travelled to Europe from Lima, informed me that a few years before, being engaged upon matters of urgent business, he had performed in one day a distance of 90 English miles on mule-back, and throughout that long distance had been accompanied by an Aymara Indian, who kept up easily with the mule, without other refreshment than a few grains of roasted maize and Coca leaves, which, mingled with undissolved chalk (? slaked lime), he chewed incessantly. On reaching the station where he had to pass the night, Mr. Campbell, though mounted on an excellent animal, found himself greatly fatigued; the guide, on the other hand, after he had stood on his head for a few minutes,[17] and had drunk a glass of brandy, set off without further delay on his homeward journey! [Footnote 17: A custom, Scherzer says, of these Indians after long and fatiguing marches, which seems to be the result of an instinct, and teaches them how best to mitigate the pressure of the blood.] “In April, 1859, Mr. Campbell despatched a native from La Paz to Tacna, a distance of 249 English miles, which the Indian accomplished in four days. He rested one day at Tacna, and set off the following morning on his return journey, in the course of which he had to cross a path 13,000 feet in height. It would seem that, throughout the whole of this immense journey on foot, he followed the Indian custom of taking no other sustenance than a little roasted maize and Coca leaves, which he carried in a little pouch at his side, and chewed from time to time. “The mail goes four times a month from La Paz to Tacna, and usually weighs 25 lb., which the courier carries on his back, and delivers within some five or six days, without other nourishment than that already specified.” According to Senor Fuentes,[18] “the incontestable facts which experience affords as to the virtues of Coca may be divided into two classes, those relating to healthy persons, and those concerning ailing or sickly individuals. It has been admitted that the Indians of the mountains, who, among the natives of Peru, are most given to the use of Coca, are these who endure the hardest labour, such as:— [Footnote 18: _Chemist and Druggist_, 1876, p. 155. Notes on Coca Leaf, by P. L. Simmonds, abstracted from “Mémoire sur le Coca de Pérou.” Par Manuel A. Fuentes (de Lima).]