School Science/How to prepare an onion cell slide

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A wet mount of the onion peel under the microscope stained with methylene blue at 50X zoom
Fig. 1
dye, pin, onion membrane, slide, and cover slip
Fig. 2
A simple student's microscope

Tissue from an onion is a good first exercise in using the microscope and viewing plant cells. The cells are easily visible under a microscope and the preparation of a thin section is straight forward. An onion is made of layers, each separated by a thin skin or membrane. In this exercise you will make a wet mount on a microscope slide and look at the cells of the onion membrane magnified by the high power, compound microscope.