[1496] I have used the edition of 1572, Vitellionis Thurinopoloni Opticae libri decem, ed. F. Risner, Basel, 1572, where the text of Witelo, occupying 474 pages, is preceded by a Latin translation of Alhazen in 288 pages. The chief modern study on Witelo is C. Baeumker, Witelo, ein Philosoph und Naturforscher des XIII Jahrhunderts, Münster, 1906.
[1497] In his preface to William of Moerbeke. “Veritatis amatori fratri Guilielmo de Morbeta vitello filius thuringorum et polonorum....”
[1498] II, 43, “Experimentaliter etiam et hoc propositum theorema potest declarari ...;” II, 46, “Sed et id quod nunc proponitur potest experimentaliter declarari ...;” X, 43, “Hoc autem potest sic experimento declarari ...” etc.
[1499] II, 42, “Huius propositionis probatio plus experientiae instrumentorum innititur quam alteri demonstrationum. Cum ergo quis experiri voluerit....” II, 44, “Instrumentaliter similiter experientia propositum theorema potest declarari....” II, 45, “Hoc quod nunc hic proponitur est conformiter prioribus per instrumentalem experientiam declarandum....” II, 47, “Illud quod particularibus experientiis hactenus instrumentaliter probatum est naturali demonstratione.... intendimus.... adiuvare....”
[1500] See especially IV, 108.
[1501] Compare Witelo IV, 108 and X, 5 with Alhazen III, 12 and VII, 10.
[1502] IX, 35, “et plus experientia quam scriptura docebit imaginum diversitates....”
[1503] IX, 35, “Ingenium vero modernorum et futurorum addat quod libuerit....”
[1504] X, 48, “Sed et in horum experimentatione est maxima latitudo quam relinquimus ad talia curiosis.”
[1505] “... divinarum virtutum influentiam inferioribus rebus corporalibus per virtutes corporales superiores modo mirabili fieri....”