of the wrist.
9, Styloid process of the radius.]

100. The ULNA articulates with the humerus at the elbow, and forms a
perfect hinge-joint. This bone is situated on the inner side of the
fore-arm.

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What is represented by fig. 13? By fig. 14? 100. Describe the ulna.

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101. The RADIUS articulates with the bones of the carpus and forms the
wrist-joint. This bone is situated on the outside of the fore-arm,
(the side on which the thumb is placed.) The ulna and radius, at their
extremities, articulate with each other, by which union the hand is
made to rotate, permitting its complicated and varied movements.

102. The CARPUS is composed of eight bones, ranged in two rows, and so
firmly bound together, as to permit only a small amount of movement.

[Illustration: Fig. 15. U, The ulna. R, The radius. S, The scaphoid bone.
L, The semilunar bone. C, The cuneiform bone. P, The pisiform bone. These
four form the first row of carpal bones. T, T, The trapezium and
trapezoid bones. M, The os magnum. U, The unciform bone. These four form
the second row of carpal bones. 1, 1, 1, 1, 1, The metacarpal bones of
the thumb and fingers.]

[Illustration: Fig. 16. 10, 10, 10, The metacarpal bones of the hand. 11,
11, First range of finger-bones. 12, 12, Second range of finger-bones.
13, 13, Third range of finger-bones. 14, 15, Bones of the thumb.]

103. The METACARPUS is composed of five bones, upon four of which the
first range of the finger-bones is placed; and upon the other, the
first bone of the thumb. The five metacarpal bones articulate with the
second range of carpal bones.

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101. The radius. 102. How many bones in the carpus? How are they
ranged? 103. Describe the metacarpus.

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104. The PHALANGES of the fingers have three ranges of bones, while
the thumb has but two.

_Observation._ The wonderful adaptation of the hand to all the
mechanical offices of life, is one cause of man's superiority over the
rest of creation. This arises from the size and strength of the
thumbs, and the different lengths of the fingers.

105. The LOWER EXTREMITIES contain sixty bones--the _Fe'mur_,
(thigh-bone;) the _Pa-tel'la_, (knee-pan;) the _Tib'i-a_, (shin-bone;)
the _Fib'u-la_, (small bone of the leg;) the _Tar'sus_, (instep;) the
_Met-a-tar'sus_, (middle of the foot;) and the _Pha-lan'ges_, (toes.)

106. The FEMUR is the long