PREFACE ix 



superfluous, and will be glad to supply the data that he feels should 

 be included. 



Doubtless, errors of various kinds have crept into the text in spite 

 of our scrupulous efforts to avoid them. Although the writer has been 

 indebted to several competent readers of his manuscript, he holds 

 himself entirely responsible for the book with all of its defects and 

 whatever virtues it may have. He will be grateful for criticism and 

 correction on the part of his readers. 



H. H. Newman. 

 Chicago, El. 



May 1, 1919. 



