"But the messages must get changed, where they have to be given so often?"
"Not at all," he said. "The couriers know nothing of the dispatches they carry."
"Oh, they are written dispatches?" Roger said. "Then you possess the art of writing?"
"Writing, what is writing?" the merchant asked.
"Letters are inscribed on paper," Roger said, "so that the person receiving them at a distance understands exactly what the one who wrote wished to say."
The merchant shook his head.
"I know nothing of what you call letters," he said. "We draw pictures, on a fabric formed of prepared skins, or of a composition of silk and gum, but chiefly on a paper prepared from the leaves of the aloe. Besides the pictures there are marks, which are understood to represent certain things. These picture dispatches are made in the form of rolls, or books. I myself have a slave who is skilled in such work, and who has depicted you, and added all particulars, and the roll has been forwarded to Tezcuco."
[Chapter 7]: A Wonderful Country.
So anxious were the merchants to avoid arriving at any town of importance, where there would be an Aztec commander and garrison, until they received an answer from Tezcuco, that they traveled by very slow stages, camping in small villages where they could obtain water and supplies. Roger asked many questions of them as to the country, and learned that the hot and arid soil they were now crossing extended only about one-third of the distance to be traversed. Then that they would pass over a range of lofty mountains, offering great difficulties to travel, that the cold was extreme, and that snow lay almost continuously upon the highest summits. After crossing this range they would journey across a rich country, and descend at last into a most lovely and fertile valley, in which lay the lake, upon which the capitals of the two countries were situated.
The country they were now traversing varied considerably. In some places it consisted of parched and sandy plains, almost free of vegetation. In others, where the rains were less able to drain quickly away, were districts of extraordinary fertility. Here grew the cocoa, vanilla, indigo and aromatic shrubs innumerable, forming thick and tangled jungles, impervious to the foot of man. Flowers of gorgeous colors bordered these groves, and lofty trees of foliage, altogether strange to Roger, reared their heads above them.