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- Download etext - Opticks
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- Download 00 Titlepage and Advertisements (64kb.mp3 file)
- Download 01 Book I Part I - Definitions (64kb.mp3 file)
- Download 02 Book I Part I - Axioms (64kb.mp3 file)
- Download 03 Book I Part I - Proposition I (64kb.mp3 file)
- Download 04 Book I Part I - Proposition II, Section 1 (64kb.mp3 file)
- Download 05 Book I Part I - Proposition II, Section 2 (64kb.mp3 file)
- Download 06 Book I Part I - Proposition II, Section 3 (64kb.mp3 file)
- Download 07 Book I Part I - Proposition II, Section 4 (64kb.mp3 file)
- Download 08 Book I Part I - Propositions III - IV (64kb.mp3 file)
- Download 09 Book I Part I - Propositions V - VI (64kb.mp3 file)
- Download 10 Book I Part I - Proposition VII, Section 1 (64kb.mp3 file)
- Download 11 Book I Part I - Proposition VII, Section 2 (64kb.mp3 file)
- Download 12 Book I Part I - Proposition VIII (64kb.mp3 file)
- Download 13 Book I Part II - Propositions I - II (64kb.mp3 file)
- Download 14 Book I Part II - Definition and Propositions III - IV (64kb.mp3 file)
- Download 15 Book I Part II - Proposition V (64kb.mp3 file)
- Download 16 Book I Part II - Propositions VI - VIII (64kb.mp3 file)
- Download 17 Book I Part II - Proposition IX (64kb.mp3 file)
- Download 18 Book I Part II - Propositions X - XI (64kb.mp3 file)
- Download 19 Book II Part I - Observations 1 - 6 (64kb.mp3 file)
- Download 20 Book II Part I - Observations 7 - 16 (64kb.mp3 file)
- Download 21 Book II Part I - Observations 17 - 24 (64kb.mp3 file)
- Download 22 Book II Part II - Section 1 (64kb.mp3 file)
- Download 23 Book II Part II - Section 2 (64kb.mp3 file)
- Download 24 Book II Part III - Propositions I - VI (64kb.mp3 file)
- Download 25 Book II Part III - Proposition VII (64kb.mp3 file)
- Download 26 Book II Part III - Propositions VIII - IX (64kb.mp3 file)
- Download 27 Book II Part III - Propositions X - XI (64kb.mp3 file)
- Download 28 Book II Part III - Propositions XII - XX (64kb.mp3 file)
- Download 29 Book II Part IV - Observations 1 - 6 (64kb.mp3 file)
- Download 30 Book II Part IV - Observations 7 - 9 (64kb.mp3 file)
- Download 31 Book II Part IV - Observations 10 - 13 (64kb.mp3 file)
- Download 32 Book III Part I - Observations 1 - 5 (64kb.mp3 file)
- Download 33 Book III Part I - Observations 6 - 11 (64kb.mp3 file)
- Download 34 Book III Part I - Queries 1 - 15 (64kb.mp3 file)
- Download 35 Book III Part 1 - Queries 16 - 24 (64kb.mp3 file)
- Download 36 Book III Part I - Queries 25 - 27 (64kb.mp3 file)
- Download 37 Book III Part I - Queries 28 - 29 (64kb.mp3 file)
- Download 38 Book III Part I - Queries 30 - 31 (64kb.mp3 file)
- Download 39 Book III Part I - Query 31 cont. (64kb.mp3 file)
- Download 40 Book III Part I - Query 31 cont. (64kb.mp3 file)