What is it about going to the dentist -- even if only for a cleaning -- that causes such anxiety? Even Dr. Lawrence, a gentle old fellow with a yet gentler assistant, his dental office in an ancient mansion on Walnut Street near Newtonville Square . . . even he caused concern for little Marash Girl. But the fun of it was that we kids were given little globules of mercury to play with at the end of our visit, globules that would soon shatter into pieces too tiny to see!