ent, the student
should state briefly and clearly the following:

1. Number and title of experiment.
2. How the experiment is performed.
3. What was observed.
4. What the experiment proves.

[Illustration: FIG. 73.--BALANCE AND WEIGHTS.]

LIST OF APPARATUS USED IN EXPERIMENTS

1 Crucible Tongs
2 Evaporating Dishes
1 Casserole
6 Beakers
12 Test Tubes
1 Wooden Stand
1 Test Tube Stand
1 Sand Bath
2 Funnels
1 Tripod
1 Stoddart Test Tube Clamp
1 Test Tube Brush
1 Burner and Tubing
2 Stirring Rods
6 Watch Glasses
2 Erlenmeyer Flasks
1 Package Filter Paper
1 Box Matches
1 Wire Gauze
2 Burettes
1 Porcelain Crucible
1 Aluminum Dish

Directions for Weighing.--Place the dish or material to be weighed in
the left-hand pan of the balance. With the forceps lay a weight from the
weight box on the right-hand pan. Do not touch the weights with the
hands. If the weight selected is too heavy, replace it with a lighter
weight. Add weights until the pans are counterpoised; this will be
indicated by the needle swinging nearly as many divisions on one side of
the scale as on the other. The brass weights are the gram weights. The
other weights are fractions of a gm. The 500, 200, 100 mg. (milligram)
weights are recorded as 0.5, 0.2, and 0.1 gm. The 50, 20, and 10 mg.
weights as 0.05, 0.02, and 0.01 gm. If the 10, and 2 gm., and the 200,
the 100, and the 50 mg. weights are used, the resulting weight is 12.35
gms. No moist substances should ever come in contact with the scale
pans. The weights and forceps should always be replaced in the weight
box. Too much care and neatness cannot be exercised in weighing.

[Illustration: FIG. 74.]

[Illustration: FIG. 75.--Pouring Reagent from Bottle.]

Directions for Measuring.--Reagents are measured in graduated
cylinders (see Fig. 74). When the directions call for the addition of 5
or 10 cc. of a reagent, unless so directed it is not absolutely
necessary to measure the reagent in a measuring cylinder. A large test
tube holds about 30 cc. of water. Measure out 5 cc. of water and
transfer it to a large test tube. Note its volume. Add approximately 5
cc. of water directly to the test tube. Measure it. Repeat this
operation until you can judge with a fair degree of accuracy the part of
a test tube filled by 5 cc. In the experiments where a burette is used
for measuring reagents, the burette is first filled wi