I want to know the answer to the following question:
Under what name were those lectures later published?
All the background I'm provided with is that "One famous story illustrating the level of difficulty of Whitehead's philosophy centers around the delivery of Whitehead's Gifford lectures in 1927–28 – following Arthur Eddington's lectures of the year previous – which Whitehead would later publish as Process and Reality:". Is that enough to answer the question?
Answer: yes