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third of this sum by the length, and the product'will be the content of the tree.

To find the solid content of a tree 30 feetlong, having the girth of the two ends 65 and52 inches.

As 22 : 7 : : 65 : 20 • 68 diam. of the large end.As 22 : 7 : : 52 : 16 • 5 do. of small end.

10 ■ 34 X 32 • 5 = 336 • 05 area of large end.8 • 25 X 26 = 214 ■ 5 do. of small end.V336 • 05 X 214 * 5=268-2 geometrical mean;

and ^---- 0 5 - + 2 1 l l- + 268-2 X 360 =98247-23

cubic inches, or 56’8 cubic feet.

This is the most correct rule; but the follow*ng, being more simple, and agreeing very nearlywith the truth, are frequently used.

Rule 2d. —Multiply the square of the meangirth, expressed in feet and decimals, by -07956,(the area of a circle whose circumference is 1,)and the product by the length.

Take the same example.

feet

4 "335-41

2)9-74

4-87 mean girth.

p2