CD very commonly numbered pages in the top right corner, with an open parenthesis, for example (13, or a circled number. Indeed this is almost always the case for Beagle geological & zoological notes or diaries, as well as for drafts of everything from essays to books. This proves to be one of Darwin's most persistent textual conventions. Hence we have introduced the normalised Ms p (1 system of page enumeration. This system is essential since many manuscripts bear multiple numbers at the top of the page, which have been assigned by librarians or prior owners. Ms p (1 is used for page numbers that are unambiguously Darwin's. At times, Darwin dropped an Ms p number in a continuous sheaf of papers. In such cases we would use, for example, [Ms p (7].