Both notebooks are headed "Lecture I." In one (pp. 1-21), CSP notes that his primary interest is in the history of the doctrine of universal mechanical necessity. What follows is a discussion of the pyramids, providing, in the main, the same material as found in MS. 1269. The other notebook (dated August 1, pp. 1-29) seems to be an earlier draft of the notebook described above. The apparently later of the two notebooks is directly continued by part of MS. 1300.
Pyramids of Egypt, history of see also Astronomy history of Mathematics history of