Manuscript, probably in the hand of a student of Newton, of the text of five lectures, delivered on 1687 Sep. 29 and following: the matter of the first part of Book III of the Principia, composed for a general reader.

In 28 sections, with an index and a title page.

Includes 3 diagrams on leaf 24.

Title at head of text: De motu corporum liber.

Perhaps copied from two autograph manuscripts, now Cambridge University Library MSS Add. 3990 and Dd4,18 -- dealer’s catalogue description.

Published, with some variants, as De mundi systemate liber (London: Tonson et al., 1731), pages 1-33; English translation, with a preface explaining the history of this text, published as A treatise of the system of the world (London: Fayram, 1728), pages 1-50.