1. Cells and the Microscope

2. The
Microscope
Iris
Diaphragm

3. Onion Cells

4. Onion Cell (Plant Cell)

5. Plant Cell

6. Cheek Cells (Animal Cell)
Cytoplasm
Cell Membrane
Nucleus

7. Animal Cell
Nucleus
Cytoplasm
Cell
Membrane

8. Differences Between Plant and Animal Cells
Plant Cell

9. Preparing a Slide

10. Lowering the Coverslip

11. Preparing a Slide (1) Place a drop of water on a glass slide.
(2) Place thin layer of onion tissue on the slide.
(3) Add a drop of iodine onto tissue to stain cells (cell wall and nucleus).
(4) Place a cover-slip on top of onion tissue at an angle.

12. Viewing the Cells (1) Place the slide on the stage of the microscope.
(2) Use the low power objective lens.
(3) Use the coarse focus wheel to bring cells into focus.
(4) Then use fine focus wheel to sharpen the image.
(5) Move up to higher power objective lens, but use fine focus wheel only to bring cells into focus.
(6) Draw onion cells.