Most readers are quite familiar with the fact that a well-developed method of picture writing, or "didactic painting," as it has been appropriately named, prevailed through Mexico and Central America for centuries before the conquest. But that, in the latter country, there was a true phonetic alphabet, is one of the more recent discoveries of American archæology, and certainly one of the most interesting, as it promises to restore to us the records of the most cultivated nation of ancient America for a number of centuries previous to the advent of the white man.