4. Weight.

Experiment 3.--Put a small piece of paper on each pan of a pair
of scales. On one place a 10 g. (gram) weight. Balance this by
placing fine salt on the other pan. Note the quantity as nearly
as possible with the eye, then remove. Now put on the paper what
you think is 10 g. of salt. Verify by weighing. Repeat, as before,
several times. Weigh 1 g., and estimate as before. Can 1 g. of
salt be piled on a one-cent coin? Experiment with 5 g.

5. Resume--Lengths are measured in centimeters, liquids in cubic
centimeters, solids in grams. In cases where it is not convenient
to measure a liquid or weigh a solid, the estimates above will be
near enough for most experiments herein given. Different solids
of the same bulk of course differ in weight, but for one gram
what can be piled on a one-cent piece may be called a
sufficiently close estimate. The distance between two lines of
foolscap is very nearly a centimeter. A cubic centimeter is seen
in Figure 1. Temperatures are recorded in the centigrade scale.

CHAPTER II.

WHAT CHEMISTRY IS.

6. Divisibility of Matter.

Experiment 4.--Examine a few crystals of sugar, and crush them
with the fingers. Grind them as fine as convenient, and examine
with a lens. They are still capable of division. Put 3 g. of