To study whether bacteria grow best where it is moist or dry
Use 2 sterile dishes. Inoculate each one by touching a sterile transmit needle to a bacteria colony rowing in another dish. Smear the material on the needle across the gelatin in every of the two dishes. Quickly replace the covers. Label one dish dry and the other moist. Dry the first dish by placing it on a diator but covered with a box. Place the single marked 'moist' in a dark warm place but where it will not try out. Study the two dishes for several days.