The text and illustrations of this book were orig- 
inally published as a series of eight articles in the 
Publication Offices, 1740 Transportation Building 
608 South Dearborn Street 
CHICAGO 
of the following dates in 1921-22: Oct. 10; Nov. 25; 
Jan. 10; Feb. 25; March 25; April 25; May 10; May 25. 
