This found in disorder and much of it is missing, including the first half of the introduction, most of articles 457-567 and 586-696, notes 5-12 and 18-35, the index from E onwards, and other shorter sections (articles 1-139 and 395-437 were probably never present in this draft but were reprinted direct from the 'Philosophical Transactions'). The backs of some of the later articles have been used for parts of a draft of 'Stresses in rarified gases' (SP XCIII).