To prepare a slide without having to label it, position the smear from the left ear on the center of the slide and a smear
from the right ear on the right third of the slide. Then if you always place the slide on the microscope so that the empty
third is on the left, the smear on the left will always be from the left ear and the smear on the right will always be from
the right ear.
Dr. Anthony DiAngelis