Written Chinese
Because the majority of modern Chinese words contain more than one character, there are at least two measuring sticks for Chinese literacy: the number of characters known, and the number of words known. John DeFrancis, in the introduction to his "Advanced Chinese Reader", estimates that a typical Chinese college graduate recognizes 4,000 to 5,000 characters, and 40,000 to 60,000 words. Jerry Norman, in "Chinese", places the number of characters somewhat lower, at 3,000 to 4,000. These counts are complicated by the tangled development of Chinese characters. In many cases, a single character came to be written in multiple ways. This development was restrained to an extent by the standardization of the seal script during the Qin dynasty, but soon started again. Although the "Shuowen Jiezi" lists 10,516 characters—9,353 of them unique (some of which may already have been out of use by the time it was compiled) plus 1,163 graphic variants—the "Jiyun" of the Northern Song Dynasty, compiled less than a thousand years later in 1039, contains 53,525 characters, most of them graphic variants.
Bernardino de Escalante
Chapter XI of the "Discurso" discusses Chinese writing system, as well as education in China. While Escalante's description of the Chinese writing is generally similar to that given by da Cruz (absence of a phonetic alphabet; around 5000 different characters, each representing not just a syllable, but a particular meaning; usefulness of the written languages for communication between people who speak mutually incomprehensible languages of China, or even languages of other nearby countries such as Japan, Ryukyu, and Vietnam; writing in vertical columns), there are also significant differences. While da Cruz gives a first-hand account of the "purser" of a Chinese boat explaining to him the essentials of the writing system (after he had finished writing a note to the Vietnamese port authorities), Escalante gives an abstract textbook-type description. da Cruz gives the correct pronunciation ("tiem") of one character (the one with the meaning "heaven" - i.e., obviously, 天, whose modern Pinyin transcription is "tian"), but does not actually show the characters. Escalante's book shows 3 sample characters, even if quite deformed and hardly recognizable, while his phonetic values are harder to interpret.