BROTHER ROGER BACON

OF THE ORDER OF FRIARS MINOR, GREATER WORK.

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FIFTH PART¹

OF THIS PERSUASION.

On the Science of Perspective; having three parts:

The first is common to the other two; the second descends specifically to direct vision primarily; the third to reflected and refracted vision. The first part has twelve distinctions.

FIRST DISTINCTION,

Which is on the properties of this science, and on the parts of the soul and the brain, and the instruments of seeing; having five chapters.

CHAPTER I.

On the properties of this science.

The sense of vision.

The roots of wisdom having been set forth, as much divine as human, which are taken from the languages from which the sciences of the Latins

¹ In O. we have, ‘Fifth Part of this persuasion, having nine distinctions. The first has five chapters. The first is on the beauty and utility of this part in general.’ No intimation is given that this is only the first part of the treatise on Perspective. The heading in the text, the first four words excepted, is that of Reg., the most important authority for this part of the work.