"Natural Right" has 16 sessions and audiofiles for 8 sessions: sessions 1 through 4 and sessions 13 through 16. The audiofile numbers correspond as follows to the sessions: 01=session 1; 02=session 2; 03=session 3A; 04=session 3B; 05=session 4A; 06=session 4B; 07=session 13 (second half only); 08=session 14A; 09=session 14B; 10=session 15A; 11=session 15B; 12=session 16A; 13=session 16B. The lectures discuss the thought of Heraclitus, Plato, Aristotle, Cicero, Thomas Aquinas, Machiavelli, Hobbes, Locke, Rousseau, and Burke, as well as the philosopher of science Ernest Nagel.

To download the audiofiles onto your computer:

Click on the file name and the mp3 player opens.
If you're using a Windows computer: https://en.wikipedia.org/wiki/Menu_key

If you're using a Mac, holding down the Control key and clicking on the player progress bar will reveal the contextual menu: "Play, Mute, Play Speed, Copy Audio Location, Save Audio As, Email Audio and Inspect Element"

Choose "Save Audio As" and you can re-name the file, or leave the name as-is and navigate to where you want the downloaded file to end up.  Click OK and the file downloads to your computer in about two seconds.  

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