16 PREFACE 



dom. It has also provided the author Avith the welcome op- 

 portunity of putting to practical application lessons learned 

 in hospital and laboratory during the last decade concerning 

 the generation and regeneration of bone. I am happy there- 

 fore to acknowledge my indebtedness to Dr. N. W. In galls for 

 undertaking to see this, manuscript through the final stages of 

 the press. 



T. W. T. 



Carling Heights Military Hospital, 

 London, Ontario. 

 May 24, 1918. 



