Matthias de Krajna (?)
Commentary on Centiloquium v. 60
A commentary on v. 60 of the Centiloquium, on the critical days and periodicities of illnesses, extant in the same two manuscripts which also preserve Matthias de Krajna’s Lectures on the Centiloquium (C.3.20). The author is probably Matthias de Krajna and the present commentary may be part of his lectures or some addition to them. The commentary includes a hexadecagonal diagram similar to the one found in the Glosa super 60 propositionem Centilogii Ptholomei (C.3.2). MS Cracow, BJ, 1839 contains an additional note, which is omitted in the other manuscript.
‘(Cracow, BJ, 1839) [figure] Circulus concludens figuram quadratam octogonam seu octo laterum et sexdecim laterum. (82r) Declaratio precedentis figure. [text] Quod Ptolomeus intendit primum de angulis quadrati conclusi intra circulum directum — nam figura sedecim laterum claudit in se nedum quadratum verum et octogonium. Hec in explanatione verbi 60 Pto<lomeus> do<cuit>. Telos. [additional note] In corpore quidem egroto continue fit repugnantia morbi — hec omnia <in> figura infra scripta clare patebunt.’
G. Rosińska, Scientific Writings and Astronomical Tables in Cracow. A Census of Manuscripts Sources (xivth-xvith Centuries), Wrocław-Warszawa, 1984, 855 and 1803.