Excerpt from Directions for Work in Histological Laboratory: For the Use of Medical Classes in the University of Michigan

From one of the layers of an onion remove a small strip of the film which is found on its inner surface. Spread out this thin membrane on a slide in a drop of water, and cover with a cover glass. In studying it use first the low power, and employ one of the smaller openings in the diaphragm. Observe the large cells, oblong or nearly square in shape, each bounded by a dis tinct cell membrane. 'notice the round or oval nucleus, usually seen at one end, or near one of the sides of the cell.

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