What did Isaac Newton teach in his early lectures as Lucasian professor?

As the Lucasian professor of mathematics, Isaac Newton was required to deliver an annual course of lectures. For his initial topic, he chose to present his work on optics.1

During the years 1670–1672, Newton used these lectures to develop his essay "Of Colours" into a more comprehensive form, which was later revised to become Book One of his work Opticks. In these lectures, he described his theory of colors, which challenged the prevailing belief that white light was simple and homogeneous. Instead, Newton argued that light is complex and heterogeneous, and that color phenomena arise from the analysis of this mixture into its simple components through refraction.1

Additionally, there is evidence that Newton also presented aspects of his mathematics and the content of his Principia from the podium during his tenure. However, historical records suggest that these early lectures did not make a significant impression on his audience at the time.1