At the beginning of the following century two German scholars, familiar with Hervas' writings, noted the 1593 Doctrina. Franz Carl Alter, [29] in his monograph on the Tagalog language, printed the Ave Maria from the text which had appeared in 1785, and Johann Christoph Adelung, [30] in his _Mithridates_, a comprehensive study of languages, included the Tagalog Pater Noster from the _Saggio pratico_ of 1787. The latter also listed in a short bibliography of the Tagalog language the Doctrina of 1593, giving exactly the same information about it that Hervas had. Neither of these men apparently saw a copy of the book, limiting themselves to extracts from Hervas, but they perpetuated an earlier reference of the utmost importance. Shortly after the two Germans published their notices of the 1593 Doctrina an entry appeared of a book printed at Manila in 1581. Jose Mariano Beristain y Sousa, a learned Mexican writer, issued in 1819-21 a bibliography of Spanish-American books, in which he listed alphabetically the authors, giving a short biography of each and adding a list of his works. Under Juan de Quinones we find: "'Arte y Vocabulario de la Lengua Tagala,' Imp. en Manila, 1581." [31] No specific authority is given for this entry, but in his sketch of the life of Quinones Beristain cited as sources, Juan de Grijalva, Nicolas Antonio, Gaspar de San Agustin, and Jose Sicardo. It would seem logical that one of these must have mentioned such a work as printed in Manila in 1581, but in tracing down the sources no such precise notice is found. Grijalva simply said that Quinones "concerned himself with Tagalog and made a vocabulary and grammar of it." [32] Antonio [33] referred to Grijalva, and carried the matter no further. San Agustin, describing the Franciscan chapter of 1578, wrote: "It was determined moreover in this chapter that P. Fr. Juan de Quinones, prior of the Convent of Taal in Tagalos, and Fr. Diego de Ochoa, prior of Bacolor in Pampanga, should compose and fashion grammars, dictionaries, and confessionaries in the two languages [respectively Tagalog and Pampanga] in which they had ventured; which they executed very promptly and well, and these were of great use to those who came to these islands, for they had these by which they could study the languages." [34] Later, San Agustin, again mentioning Quinones, referred to Grijalva, and added as an additional source for his information Tomas de Herrera. Sicardo [35] added nothing new. Herrera, not cited directly by Beristain, may however have been the source from which the "Imp." of his entry came. Herrera wrote: "He [Quinones] was the first to have learned the Tagalog language of which he published a grammar and dictionary as an aid to the ministers of the gospel."