AUTHOR'S PREFACE TO FOURTH EDITION.
I so much regret that many people have had to wait for the book, or been unable to get it. The paper restrictions and difficulties of printing and binding have been great. At first the publisher started with a modest edition of 2,000, not knowing what sort of reception the book would have. Now that we know that people not only need the book but really want it we hope to be able to keep it in print, instead of perforce having it so often "reprinting," as it has been in the first few months of its existence.
MARIE CARMICHAEL STOPES.