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 whole theory of the inflections of a cubic curve is discussed in a very interesting manner by means of the canonical form of the equation x +y +z +6lxyz= o; and in particular a proof is given of Plucker's theorem that the nine points of inflection of a cubic curve lie by **threes** in twelve lines.

It has 12 faces, which meet in 30 edges; these intersect in **threes** to form 20 vertices.

Later I said, "Make fifteen **threes** and count."

I wished her to make the groups of **threes** and supposed she would then have to count them in order to know what number fifteen **threes** would make.

But instantly she spelled the answer: "Fifteen **threes** make forty-five."

The wounded crept together in twos and **threes** and one could hear their distressing screams and groans, sometimes feigned--or so it seemed to Rostov.

The officers, as usual, lived in twos and **threes** in the roofless, half- ruined houses.

Behind them along the narrow, sodden, cutup forest road came hussars in **threes** and fours, and then Cossacks: some in felt cloaks, some in French greatcoats, and some with horsecloths over their heads.

Pierre walked along, looking from side to side, counting his steps in **threes**, and reckoning them off on his fingers.