Over the bridge which spans the railway two miles from Canterbury a girl was riding a bicycle. She was perfect mistress of her machine--and nerves; for on the slope of the hill she let the wheels run freely, and did not trouble to use the brake. The white dust clouded the air as she spun down to the level; and the heat of the day--a July noon--was so great that she was fain to dismount for the sake of coolness. A wayside fence offered a tempting seat; and, with a questioning glance to right and