8 PREFACE 



pressed in the last few paragraphs of this note 

 should prove correct, then this will fortify the Dar- 

 winian Theory of the Origin of Species, to the extent 

 of positive demonstration at a point where its in- 

 sufficiency is now apparent. 



The author cannot refrain from this public ex- 

 pression of the gratitude he feels toward Professor 

 Frederick Starr of Chicago University, for directing 

 his thoughts by a series of lectures to the problems 

 discussed in this book; and toward his distin- 

 guished critics for the generous encouragement and 

 valuable instruction contained in their letters. To 

 them the credit is due, in so far as this work is free 

 from errors. The author is responsible for those 

 which he has failed to discover, and he sincerely 

 hopes that unsparing criticism will remove all of 

 them. Thus only can this book contribute to " a 

 resolute facing of the world as it is with all garment 

 of make-believe, thrown off." 



T. W. Heineman. 



Pasadena, Cal., U. S. A., January, 1908. 



