ACKNOWLEDGMENT 



In offering this small volume to those who may read it 

 the author wishes to express her own indebtedness, not alone 

 to the men and to the women whose books have supplied 

 her with facts and with inspiration, but also to relatives 

 and personal friends who have shared in her work as coun- 

 selors, and to authorities of distinguished attainment who 

 have given the manuscript careful reading. Among these 

 should be mentioned Professor Irving Fisher of Yale Uni- 

 versity, Professor W. L. Tower and Professor G. H. Mead of 

 The University of Chicago, Professor Thomas M. Balliet 

 of New York University, Dr. Luther H. Gulick of New 

 York City, and Professor Adolf Meyer of the Johns Hopkins 

 Universitv. 



Acknowledgment is also made to authors and to publishers 

 through whose kindness many of the illustrations of this book 

 have become possible ; also to Mr. Victor David Brenner for 

 permission to represent on the cover his medallion, " The 

 Successors to the Fates." Having been designed for the 

 Fifteenth International Congress of Hygiene and Demog- 

 raphy, this emblem most appropriately shows that " the distaff 

 from which is spun the thread of life is held to-day by the 

 forces of modern hygiene." 



FRANCES GULICK JEWETT 



