Roman Catholic missionaries also wrote accounts of the Aztec. Paradoxically, the priests generally showed more understanding and tolerance than did the laymen. Thanks to their training and theological knowledge, they were able to analyze the Indian mind and to gain insight into the meaning of the myths and ritual. The missionaries, as a rule, learned the native languages, especially Náhuatl. Postconquest histories of the Aztec written in Spanish
Within a few decades of the conquest, a series of histories had been written in the Spanish language, based in part on Aztec books and in part on information supplied by the upper class. Among the most detailed of these is the three-part Historia de las Indias de la Nueva España e Islas de Tierra Firma (“History of the Indies of New Spain”), written in about 1580 by the Dominican friar Diego Durán. Postconquest ethnographic accounts written in Spanish and Náhuatl
These works are comparable in methodology and subject matter to the kinds of studies of native peoples conducted by present-day anthropologists. Probably the finest of them was written by Bernardino de Sahagún. Sahagún was a Franciscan priest who arrived in Mexico very early (1529), learned the Náhuatl tongue, and spent his life building a wonderful monument, a real encyclopaedia called the Historia general de las cosas de Nueva España (“General History of the Things of New Spain”). His work covers virtually all aspects of Aztec culture. It contains particularly detailed accounts of religion, ethnobotany, folk medicine, and economics, dictated to him in Náhuatl by Aztec noblemen and priests. As a source, it has the added value of being written in both Náhuatl and Spanish. One of the most complete versions of this work, written in Náhuatl, is called the Florentine Codex.
“Siguense veynte y seis addiciones desta postilla” (1560–79; “A Sequence of Twenty-six Additions to the Admonitions”) by Franciscan Bernardino de Sahagún. The 26 additional admonitions to the appendix of Sahagún's doctrinal writings exhort the Aztecs to pursue Christian virtues. The writings preserve a record of the Aztec culture and Nahuatl language.The Newberry Library, Gift of Edward E. Ayer, 1911 (A Britannica Publishing Partner)
The codices
Aztec sacred books and works, which were kept in the temples, and other native books have become known in Western scholarship as codices. Sacred books were written (or rather, painted) on deerskin or agave-fibre paper by scribes (tlacuiloanime), who used a combination of pictography, ideograms, and phonetic symbols and dealt with the ritual calendar, divination, ceremonies, and speculations on the gods and the universe. Because of their religious content only a small fraction of these escaped destruction by the Spaniards; the few specimens that have survived—such as the Codex Borbonicus, the Codex Borgia, the Codex Fejérváry-Mayer, and the Codex Cospi—usually come accompanied by Spanish notations. These sources are limited in scope and subject matter but nevertheless are valuable documents. Their interpretation is far from easy. Only a few of them, such as the Borbonicus, are truly Aztec, while others, such as the Borgia, seem to emanate from the priestly colleges of the “Mexica-Puebla” area, between the central highlands and the Oaxaca Mountains.
An illustration from a reproduction of the Codex Magliabecchi depicting an Aztec priest performing a sacrificial offering of a living human heart to the war god Huitzilopochtli.Library of Congress, Washington, D.C. (neg. no. LC-USZC4-743)
Other native books, either pre-Cortesian or post-Cortesian, also afford valuable material. Examples include such manuscripts as the Codex Telleriano-Remensis, the Azcatitlan, and the Codex of 1576, which describe the history of the Aztec tribe and state and occasionally depict religious scenes and events; the Codex Badianus, an herbal with magnificent drawings of medicinal plants; and the Codex Mendoza and the Matrícula de tributos, both tax documents of the Aztec empire. A number of books were written in the Latin alphabet—either in Náhuatl or in Spanish—by learned Aztec chroniclers, who used ancient pictographic manuscripts as their basis. Among those that were prepared in central Mexico are the Codex Chimalpopoca (also called the Anales de Cuauhtitlán; “Annals of Cuauhtitlán”), in Náhuatl, and the Codex Ramírez (also called the Historia de los mexicanos por sus pinturas; “History of the Mexicans Through Their Paintings”), in Spanish; both are anonymous compilations. Official ecclesiastical and government records
Much of this literature is unpublished. Its purpose was administrative rather than intellectual, but it has provided an extraordinarily rich source of information for all 16th-century ethnic groups. The documents vary from tax lists, censuses, and marriage and baptismal records to broad geographic-economic surveys. Among the most valuable of the last type are the Relaciones geográficas of 1579–85, a series of surveys ordered by Philip II of his overseas possessions. Formal questionnaires were drawn up that demanded information from each town in the empire on virtually all aspects of Meso-American life: questions on the natural environment and resources, crops, population history, settlement patterns, taxes paid, markets and trade, the language, native history and customs, and progress of the missionization program. William T. Sanders Jacques Soustelle Agriculture
The homeland of the Aztec, from which they ruled their vast domain, was a large (about 3,000 square miles), mountain-rimmed basin with a floor at approximately 7,000 feet above sea level. The surrounding ranges reached a maximum elevation of 18,000 feet in the volcano of Popocatépetl. The annual rainfall varied from 20 to 35 inches (500 to 900 millimetres) in the valley floor to a maximum of 50 inches on the southern escarpment. Approximately 80 percent of the rain fell between May 1 and October 1. Because of the high elevation, the area suffered from severe winter frosts that normally began in mid-October and lasted until the end of March. Normally, the rainfall was adequate for corn, even in the drier portions of the basin, but a major problem was the timing of the rains and the frosts. A delay of the rainfall to mid- or late June, accompanied by early autumn frosts, could produce crop disasters.
Another major problem for the pre-Hispanic cultivator was the paucity of level land. Much of the land surface is sloping, and the problem of soil erosion was acute. Furthermore, of the 1,600 square miles of relatively level land, 400 square miles were occupied by a chain of lakes; and much of the immediate lakeshore plain was waterlogged.
Because of the effect of elevation on the growing season, the areas above 8,300 feet were also unsuitable for cultivation, removing an additional 400 square miles from the agricultural resource. Even within zones of cultivation, the presence of steep slopes and thin soil further reduced the area of cultivation. It is doubtful that more than 50 percent of the basin was suitable for labour-intensive methods of cultivation. Yet in 1519 it supported a population of 1,000,000 to 1,500,000; i.e., a density of 500 people per square mile (200 per square kilometre), the densest population in Meso-American history. This was achieved by an extraordinarily intensive system of farming that involved a number of specialized techniques. Soil fertility was maintained by plant and animal fertilizers, by short-cycle fallowing, and by irrigation. In gently sloping terrain, erosion was controlled by earth and maguey terraces, in steeper areas by stone terracing. The problem of humidity was solved by canal irrigation of both the floodwater and permanent type. Much of the irrigation was done just before planting in April and May in order to give crops a head start and hence avoid the autumn frosts. Terracing functioned also as a method of conserving moisture. There is also evidence that dry-farming techniques were applied to store moisture in the soil. The most significant achievement of Aztec agriculture, however, was that of swamp reclamation, even including colonization of the lakes. This system of farming, called chinampa, was first applied to Lake Chalco. The lake covered approximately 60 square miles and apparently varied in its character from swamps to ponds of fairly deep, open water. By a process varying from digging drainage ditches to artificial construction of land from lake mud and vegetation, most of the lake was converted to highly productive agricultural land. A series of masonry causeway dikes were constructed across the lake to control flooding. By a system of dikes and sluice gates the Aztec even managed to convert a portion of saline Lake Texcoco, the largest and lowest lake in the basin, to a freshwater bay for further chinampa colonization.