12 PREFACE 



was kindly read for me by my very dear and 

 deeply regretted friend, the late Fr. Michael 

 Maher, S.J., whose kindness in this and other 

 ways I can never forget. 



My friends, the Right Rev. Mgr. Parkinson 

 and Professor Hartog, D.Sc., have read parts 

 of the present volume, and thus laid me under 

 deep obligations. Need I say that whilst the 

 former bears no responsibility for my science, 

 the latter is equally innocent in respect of my 

 philosophy. 



BERTRAM C. A. WINDLE. 



