[2146] Pierre d’Ailly in 1410 in De Legibus et Sectis, cap. 4, pointed out that Bacon was relying upon a spurious work.
[2147] Little, Essays (1914), 16, quoting Adamson, Roger Bacon: The Philosophy of Science in the Middle Ages (1876), which is now out of print.
[2148] Ptolemy’s Optics is known only in Latin form, supposedly translated from the Arabic, edited by Govi (Turin, 1885); see Bridges, I, lxx. The Optica ascribed to Euclid is contained in Heiberg’s edition (Leipzig, 1895).
[2149] Baur, in Little, Essays (1914), 46-47.
[2150] D. E. Smith in Little, Essays (1914), 171, citing Heilbronner and other historians of mathematics.
[2151] Bridges, II, 172-173; Opus Tertium, Brewer, 43.
[2152] Little. Part of Opus Tertium (1912), 44.
[2153] Opus Tertium, Brewer, 44-45.
[2154] Gasquet, 510.... scientie omnes preter hanc vel utuntur argumentis tantum ad probationem conclusionum suarum, ut pure speculative scientie, vel habent experientias universales et imperfectas.
[2155] Bridges, II, 172. Haec ergo sola novit perfecte experiri quid potest fieri per naturam, quid per artis industriam, quid per fraudem, quid volunt et somniant carmina conjurationes invocationes deprecationes sacrificia....