"Some of the yellow sheets I used to insert into the manuscript whenever I lifted even one page for Erskine, Nadia, Kings or Dalton to work upon. When one has a manuscript as long as this one, as intricate, and as closely interlocked in its parts, the loss of even one page can be devastating. I have therefore always followed the practice of allowing not one page to be removed without making a note of where it has gone. I do this on slip sheets of cheap yellow paper and insert them to represent the missing pages. I cannot relate how helpful this has been and how confused and mixed up I would often have been without them. Sometimes, in the preparation of this manuscript, I had segments of it (1) with Erskine, (2) on the way to Erskine, (3) with Nadia being typed, (4) on the way to Nadia to be typed, (5) on the way from Nadia to Erskine, (6) with Kings or Dalton or Laird to be edited, (7) with any one of a dozen experts to be read for accuracy. Only the most careful mothering of this flock of papers enabled me to hold them together in some form or other."