



Produced by Al Haines.




[Illustration: Cover art]




[Illustration: _Her child eyes were still upon him and seemed to ask for
something yet.  And, at this, he bent and kissed her gently, as he would
have kissed a child, and did not guess that, at the touch of his lips,
Sidonia's woman's soul was born_. (See page 196.)]




                          "IF YOUTH BUT KNEW!"


                                   BY

                         AGNES & EGERTON CASTLE

                               AUTHORS OF
                   "ROSE OF THE WORLD," "FRENCH NAN,"
                               ETC., ETC.



    "_Si jeunesse savait..._
    _Si vieillesse pouvait!_"
      (_Old French Song_)



                  WITH ILLUSTRATIONS BY