Getting ready to grow bacteria

Secure two or three dozen shallow glass dishes. The glass coasters used to stay bed castors from marring floors will do. Cut 5 cm squares of window glass to make covers for the coaster dishes. These will serve very well for bacteria gardens. For starting experiments slices of potato, carrot, or sweet potato will serve as soil upon which to grow the bacteria. Cut slices of these foods about 6 or 8 mm thick and large sufficient to fit simply into the dish