(i) Letter addressed "Sir". Observations arranged in 13 points in answer to the correspondent's papers. Clarke discusses Sir Isaac Newton's work in relation to the correspondent's. 28 Sep 1706.
(ii) On the verso "Mr Clarks vindication of S(ir) I Newton". Set out in 5 points. Nd.
(iii) Letter from Clarke to "Mr North at his house at Rougham near Swaffham in Norfolk". Discussion of physical hypothesis etc. Note on verso "All these Letters are transcribed by my Father in a Book". Dated at London. 26 Oct 1706.
(iv) Letter from Clarke to "Mr North at his house at Rougham near Swaffham in Norfolk". Remarks in answer to North's last letter. Includes discussion of the movement of the planets etc. 21 Nov 1706.