1. Introduction to the Cell Theory
Students will have their microscopes out, for reference as we go through each of the steps. As an introduction, students will be asked what kinds of things they can do with this tool.

2. Robert Hooke, 1665 English born scientist and inventor.
The first person to describe cells.

3. Robert Hooke developed this microscope and illumination device that was considered one of the best microscopes of his time.

4. Robert Hooke observed cork from the bark of a cork tree
Robert Hooke observed cork from the bark of a cork tree. He thought the cork looked like little boxes. He names them cells which means “little rooms” in Latin.

5. Robert Hooke wrote a bestseller of his time called Micrographia
Robert Hooke wrote a bestseller of his time called Micrographia. This book detailed the observations he made with his illuminated microscope device.

6. Anton Van Leeuwenhoek
Dutch Merchant that used a microscope to examine pond scum.
He saw small organisms that he called animalcules, which means “little animals” .
Today we call these single-celled organisms protists.

7. Leeuwenhoek was the first person to see bacteria
Leeuwenhoek was the first person to see bacteria. He also discovered that the yeast that makes bread rise is a single-celled organism.

8. Almost 200 years passed before scientists concluded that cells are present in all living things.
In 1838, Matthias Schleiden concluded that all plant parts were made of cells.
In 1839, Theodor Schwann concluded that all animal tissues were made of cells.
in 1858, Rudolf Virchow stated that all cells could form only from other cells.

9. The Cell Theory All organisms are made of one or more cells.
• The cell is the basic unit of all living things.
• All cells come from existing cells.

10. Introduction to the Microscope
Care
Parts
Focusing
Students will have their microscopes out, for reference as we go through each of the steps. As an introduction, students will be asked what kinds of things they can do with this tool.

11. Microscope Care Always carry with 2 hands
Only use lens paper for cleaning
Do not force knobs
Always store covered
Keep objects clear of desk and cords
Teacher demonstrates how to hold the microscope, where the lens paper is located and how to use it. Students will be invited to turn the knobs and observe the stage as it moves up and down. Teacher will demonstrate how to store the microscope.

12. Microscope Parts Eyepiece Body Tube Revolving Nosepiece Arm
Objective Lens
Stage
Stage Clips
Coarse Focus
This is the exact version of the microscope used in class. Students will be identifying the parts on the microscopes at their desks as we go along and what their functions are.
Diaphragm
Fine Focus
Light
Base

13. Using the Microscope Place the Slide on the Microscope Use Stage Clips
Click Nosepiece to the lowest (shortest) setting
Look into the Eyepiece
Use the Coarse Focus
Give students a slide from the “common things” set, each student will practice focusing and changing objectives.

14. Using High Power Follow steps to focus using low power
Click the nosepiece to the longest objective
Do NOT use the Coarse Focusing Knob
Use the Fine Focus Knob to bring the slide
Have students exchange slides so they can look at different things, walk them through using the high power objective to focus slides. Emphasize not using the coarse objective during this process, as it will crack the slides.
What can you find on your slide?

15. Fill in the table on your worksheet.
To calculate the power of magnification, multiply the power of the ocular lens by the power of the objective.
What are the powers of magnification for each of the objectives we have on our microscopes?
Fill in the table on your worksheet.

16. Comparing Powers of Magnification
We can see better details with higher the powers of magnification, but we cannot see as much of the image.
Which of these images would be viewed at a higher power of magnification?