Slow...Going... It's not the swallows returning to Capistrano, but each year about this time, the turtles return to the starting line in East Baltimore. Last Friday marked the 64th annual Turtle Derby, held at the Pre-Clinical Courtyard behind Welch Library. Proceeds from the event benefit the Johns Hopkins Children's Center's Child Life Department and the hospital's Perkins Day Care Center, although departments sponsoring first, second and third place winners receive modest prize money. The Turtle Derby, with its attendant carnival atmosphere, began 42 years after longtime Hopkins utility man Benjamin Frisby started his turtle farm near the hospital. This year's first place winner (with a $100 purse) was Pizza, sponsored by the Hopkins chapter of the American Medical Association.