1. Lab 3: Microbes
Today’s lab is a group effort
Hand in one worksheet per group
Read pgs 25-29
(skip the section on the Dissecting Microscope)

2. Compound light
microscope
_____ lens power X =
Total magnification

3. Insert letter E slide (item 5, pg 27)

4. Searching (read pg. 31):
Start at 100x magnification
Start with stage all the way up
Lower stage slowly while looking
If you see something, move stage sideways
If object doesn’t also move, it’s not on the slide
5) Beware of lint on the surface of the slide
6) After reaching the right depth, search systematically:

5. How to prepare a wet mount slide
(read pg. 33)

6. Procedures (pg 30)
Make drawings on pg 37-38
Answer questions about slides on pg 39
(before you put the slide away)
Do Hawaiian sand only if time allows

7. How to prepare onion skin
Methylene blue stain
How to prepare cheek cells
Methylene blue stain
How to prepare Elodea
Cytoplasmic streaming
No stain
How to prepare live microorganisms
No stain
Collect near bottom of container, not at bottom
Suck in a little substrate

8. Putting your scope away