Further, I wish it to be clearly and distinctly understood that my researches are based upon an essay by M. Paul Fabre, _La Vaticane de Sixte IV._, which had appeared in the _Milanges d'Archeologie et d'Histoire of the Ecole Francaise de Rome_ for December 1895, but of the existence of which I had never heard until Father Ehrle shewed it to me. On reading it, I found that M. Fabre had completely anticipated me; he had done exactly what I had come to Rome to do, and in such a masterly fashion that I could not hope to improve upon his work. After some consideration I determined to verify his conclusions by carefully examining the locality, and to make a fresh ground-plan of it for my own use. I have also studied the authorities quoted by M. Eugene Muentz (_Les Arts a la Cour des Papes_) from my own point of view. There are two works to which I shall frequently refer: _Les Arts a la Cour des Papes pendant le xv^e et le xvi^e siecle_, par Eugene Muentz: Part III. 1882 (Bibl. des Ecoles Francaises d'Athenes et de Rome, Fasc. 28): and _La Bibliotheque du Vatican_ _au xv^e Siecle_, par Eugene Muentz et Paul Fabre; Paris, 1887 (Ibid. Fasc. 48). The former will be cited as "Muentz"; the latter as "Muentz et Fabre." My paper, of which an abstract only is here given, has been published in the _Camb. Ant. Soc. Proc. and Comm._ 6 March 1899, Vol. X. pp. 11-61. [366] This document, dated 17 December, 1471, has been printed by Muentz, p. 120. I am afraid that this order can have but one meaning: viz. the excavation and destruction of ancient buildings. [367] This is the date assigned by Platina himself. See below, p. 231. [368] MS. Vat. Lat. 3947, fol. 118 b. Notatio omnium librorum Bibliothecae palatinae Sixti quarti Pont. Max. tam qui in banchis quam qui in Armariis et capsis sunt a Platyna Bibliothecario et Demetrio Lucense eius alumno custode die xiiii. mensis Septemb. M.CCCC.LXXXI facta. Ante vero eius decessum dierum octo tantummodo. This _Notatio_ has been printed, Muentz et Fabre, p. 250, but without the catalogue to which it forms an appendix. This, so far as I know, still remains unprinted. [369] Muentz et Fabre, pp. 148-150, _passim_. [370] _Ibid._ p. 32. [371] _Ibid._ p. 141. The catalogue is printed pp. 159-250. [372] MS. Vat. 5008. [373] These accounts, now preserved in the State Archives at Rome, have been printed with great accuracy (so far as I was able to judge from a somewhat hasty collation) by Muentz, _Les Arts a la Cour da Papes_, Vol. III. 1882, p. 121 sq.; and by Muentz and Fabre, _La Bibliotheque du Vatican au xv^e Siecle_, 1887, p. 148 sq. [374] The entries referring to these purchases are given in full, with translations, in my paper above referred to.