PEEFACE 



as to prejudice the authors in favor of any definite 

 and exclusive title. In fact they feel that bicker- 

 ing on matters of terminology where the subject 

 matter is universally agreed upon is apt to denote 

 a tendency to decadence, rather than to vigorous 

 constructive work. 



The authors are indebted to Professor J. C. 

 Blair, Professor Charles Mulford Robinson, Pro- 

 fessor H. B. Dorner, Mr. F. A. C. Smith, of the 

 University of Illinois and Mr. G. R. Forbes, of 

 New York, for their courtesy in allowing them to 

 reproduce several of the photographs used as illus- 

 trations. Some of the illustrations, several of the 

 plans, for instance, are copies made from the work 

 of students at the University of Illinois. Some 

 were redrawn, others were used exactly as pre- 

 sented. The drawings are the work of C. F. Kel- 

 ley. 



September 29, 1914. 



