This lecture discusses key ideas from the 18th century philosopher Immanuel Kant's work, The Prolegomena to Any Future Metaphysics. Specifically it focuses on his discussion in the Second Part Of The Transcendental Problem: How Is Pure Natural Science Possible? Specifically this bears upon what Kant calls "principles of possible experience". Principles (Grundsatze) are rules that are not determined by other rules, and these correspond to pure concepts of the understanding. Taken as a totality, they comprise a system which provides the laws of nature, and a pure natural science To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 3,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Kant's Prolegomena to Any Future Metaphysics - https://amzn.to/49pc1Xm