The second, and wider group for whom this translation is intended is that which has a need for an edited edition of an important document in the history of grammatical description. In this area of scholarship Collado's work is of more than moderate significance. It was accepted for publication by the prestigious Propaganda Press; and, even if those more familiar with Japanese than the editorial board of that Press might have had serious reservations concerning the linguistic accuracy of the text, it is reasonable to assume that the Press judged it to be a good example of grammatical description. It thus represents a grammar of a non-European language which suited the requirements of the day for publication at Rome.[5] {3} In order to permit this translation of the _Ars Grammaticae_ to be of use in both these areas of scholarship I have made an effort to reduce to a minimum those places where a knowledge of either Japanese or Latin is required for the comprehension of the translation. It is sincerely hoped that the result is not an effort that is satisfying to neither, and thus to no one. Because of the derivative nature of the text, this translation has put aside a number of important philological problems as better dealt with within the context of Rodriguez' grammars. This decision has its most obvious consequences in the section on the arithmetic, where innumerable data require exposition. However, since a basic purpose of this translation is within the context of the history of descriptive grammar, these tantalizing side roads have been left unexplored. It is, nevertheless, hoped that this translation will serve as a convenient tool for those wishing to make a more detailed investigation into the philological questions raised by the text. But I must caution those who would undertake such an inquiry that they had best begin with a careful study of the works of Father Rodriguez. With its limitations acknowledged, the _Ars Grammaticae Iaponicae Linguae_ remains a document worthy of our interest, and I offer this translation in order that Collado's work may more easily find its proper place in the history of descriptive grammar. _The Grammatical Framework_ Collado perceived his task to be the presentation of a grammar of Japanese which would have sufficient scope to equip those dedicated to the propagation of the faith with a knowledge of the proper spoken language of his time. While he concludes his grammar with a brief, and rather presumptuous, statement concerning the written language, his purpose is clearly to train his students in the fundamentals of colloquial speech. His sensitivity to this point is demonstrated by his carefully transforming those examples presented by Rodriguez in the written language in the _Arte_ into correct colloquial expressions in his own grammar.