One of the joys of looking at these school portraits is playing spot-the-relative. Here's a class photo for Marcella Armstrong's 5th and 6th grade class in Tidioute, taught by a Mrs. Scudder. Mrs. Scudder may be a relative of my college roommate John Scudder, although we're not positive. This photo is from 1915.
This one is pretty easy: she's down in front. In this close-up, she's the one with the "casual Friday" loose tie look and her elbows up on the desk.
Unfortunately, I don't know who anyone else is in the big class portrait.