The parts of the flower are most frequently arranged in **fives**, or multiples of **fives**; for instance, a common arrangement is as follows, - five sepals, succeeded by five petals, ten stamens in two sets of five, and five or fewer carpels; an arrangement in fours is less frequent, while the arrangement in threes, so common in monocotyledons, is rare in dicotyledons.

The parts of the flower are in **fives** in calyx, corolla and stamens, followed by two carpels which unite to form a superior ovary.

Ten is two **fives**, 15 three **fives**, 20 is a "man" (ten fingers and ten toes), 100 is "five men," and so on.

The flowers are hermaphrodite and regular with parts in **fives** (pentamerous) throughout, though exceptions from the pentamerous arrangement occur.

Finger-counting is of course natural to children, and leads to grouping into **fives**, and ultimately to an understanding of the denary system of notation.

Five equilateral triangles covertically placed would stand on a pentagonal base, and it was found that, by forming several sets of such pyramids, a solid could be obtained which had zo triangular faces, which met in pairs to form 30 edges, and in **fives** to form 12 vertices.

It has 12 pentagonal faces, and 30 edges, which intersect in **fives** to form 12 vertices.