Onion Epidermal Cells
Take care to obtain a single layer of cells; avoid having the cells fold into several layers.
Try staining with iodine (I2KI) to observe transparent structures in the cell.
Observe structures such as cell wall, nucleus, vacuole, chloroplasts.
You may see organelles moving along cytoskeleton: cytoplasmic streaming:
Human Epithelial Cells
Try staining with methylene blue.
Use methyl cellulose to immobilize.
©Copyleft Peter Chen