We do not deem it necessary to assure the reader that while the Aztec picture-writing was not as far advanced in the scale of graphic development as the system employed by the Mayas, still it was an accurate means of communication and of recording events. The “scribes” of the Mexicans were an educated class of men, who with strictest accuracy painted in hieroglyphic symbols the record of national, historic and traditional affairs, as well as the tribute rolls, the calendar with its feast days, the stated services of the gods, the genealogical tables of noble and royal personages, and even the customs of the humble classes. No doubt many educated persons who did not belong to the priestly and lettered class, were acquainted with the system employed, and many others understood it sufficiently to recognize calendar and feast signs. The Aztec books were painted mostly on cotton cloth, prepared skins and maguey paper, and when not rolled were folded fan-like and bound with thin wooden covers, like the Maya books. The priests who accompanied the conquerors and immediately followed them, mistook the pictured figures painted in these books to be representations of heathen deities, and consequently inaugurated a system of wholesale destruction of all the picture-writing. Las Casas informs us that they were actuated by the fear that in matters of religion the existence of these books would be injurious. The infamous crime committed against the cause of knowledge and the irreparable injury done to the natives, their successors, and to students of history for all time, by the destruction of those valuable MSS., must ever remain an unerasable blot upon the name of the early church in Mexico, and must be ranked with the worst deeds of Goths and Vandals. Juan de Zumárraga, the chief of these sacrilegious destroyers who committed the annals of the Mexican States publicly to the flames in his tour of the principal cities of the country, will ever be remembered with proper contempt. Fortunately, many of the MSS. were hidden by their owners and have since come to light; the greater number of these, however, were tribute rolls, which, down to the last century, played an important part in the Mexican courts of justice. Prescott informs us that “until late in the last century, there was a professor in the University of Mexico especially devoted to the study of the national picture-writing. But as this was with a view to legal proceedings, his information probably was limited to deciphering titles.” In the course of time the priests became acquainted with the harmless nature of the hieroglyphics, through their use by the natives in their making confessions and in recording the Lord’s prayer. Many documents written since the conquest were provided by their authors with a Spanish translation or with an explanation in Aztec written with Spanish letters. Many of these are in existence, and with a few authentic documents, written previous to the conquest, are preserved