Morphologic Changes in Blood Following the Extraction of Pulpless Teeth**From the Department of Oral Pathology and Therapeutics, State University of Iowa, College of Dentistry.Read before the Section on Histology, Physiology, Pathology, Bacteriology and Chemistry (Research) at the Sixty-Ninth Annual Session of the American Dental Association, Detroit, Mich., Oct. 25, 1927.