A Doctor's Diary is told through the eyes of Dr. Dan Norris (John Trent),resident physician in a private hospital. In his search for a cure for spinal meningitis, Norris recklessly runs roughshod over the feelings of his colleagues. The doctor's older, wiser supervisor, Dr. Clem Driscoll (George Bancroft),tries to curb Norris' impatience, pointing out that nothing takes place overnight. Angrily, Norris accuses Driscoll of malpractice and is forced to resign from the clinic -- just when a meningitis epidemic breaks out.

• George Bancroft
• Helen Burgess
• John Trent
• Ruth Coleman
• Ronald Sinclair
• Molly Lamont
• Sidney Blackmer
• Charles Waldron