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3.

II. Oval type: Body with oval cross-section; bone made only.

III. Almond type: Cross-section of the body is almond shaped.

1. Without ridge

2. With one ridge,
a. Without base and tapering to the stem.
b. With base.

3. Double ridges,
a. Without base, with a secondary stem,
b. With base and a secondary stem,
c. Sharp ridge, concave base; cross-section of the body like an irregular quadrangle.
d. Rounded ridges and concave base, cross-section of the body like an unequal cross. All bronze arrow-heads are of these type; and shells.

IV. Triangular type: Cross-section of body triangular.

1. Straight edge.
a. Without base, tapering to the stem.
b. With a round, secondary stem ending at a circular base.
c. With flat base(stone made only).
 
This bone series seems to be so closely related and evolutionary that althou the bronze arrow-head ^[[(XXI:1)]] takes only the form III.3 d,it is difficult to assign it an independent origin. It is evident that arrow-heads were used in ancient China before the invention of bronze; when bronze was introduced, the arrow-head had been developed to a stage corresponding to III 3 d of the bone series.