Observe how the stomata of the leaf epidermis skillfully tear the lower epidermis of the leaf.

1. First, aim the microscope at the light. Note: A. The base should be about a fist away from the table. B. the lens barrel can only rotate upward.

2. Drop a small drop of water on the glass slide with a dropper (standby)

3. Tear off the lower epidermis (that is, the back) of a small piece of bean leaves with tweezers (clever tearing method is to clamp the cells attached to the cotyledons together, so that a larger piece can be cut off after tearing off, leaving a thin epidermis). Place it on the water drop of the slide and cover it with a cover glass. Absorb the water at the bottom of the slide with absorbent paper. If you are careful, there will be no water. )

4. Place the slide on the microscope stage and adjust the distance of the lens barrel (upward only) for observation.