Thames & Kosmos Kids First: Biology Lab handleiding

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Handleiding

EXPERIMENT 10

Gateway to the Microcosm

“Fishing in the dark”

with your biological

collecting station

YOU WILL NEED

› 4 slides, cover slips

› 2 corks (from wine bottles), pocket knife, string,

1 plastic bag filled with rocks or sand, 1 piece

of polystyrene foam, 1 permanent marker for

marking your slides

HERE’S HOW

1. Have an adult help you bore a hole through

the length of each cork and thread the string

through the holes. Secure the string with a

knot at the top and a knot below.

2. In the top cork, make two horizontal slits for

the slides and make two vertical slits in the

bottom cork, and clamp the slides in the

corks.

3. Tie a piece of polystyrene foam to the top end

of the string to serve as a float, and tie the

sand-filled bag to the bottom end to serve as

an anchor or sinker.

4. Mark the slides with a symbol or H1/H2

(horizontal) and V1/V2 (vertical), and take

the collecting station to a pond.

5. After about a week or two, bring your pond

specimen collection station home in a bucket

of pond water. Before you look at your “prey”

under the microscope, wipe one side of each

slide clean with a cloth.

6. The other side of the slide should not be

soaking wet when you view it under the

microscope. Let it dry a little before viewing.

Put one or more cover slips on the slide,

position it on the microscope stage, and begin

your observations.

Note: When constructing the

collecting station, particularly when

boring the holes for the string and

making the slits for the slides, it is

absolutely essential to have an adult

help you.

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