Why the principal difference is the formation of their beaks or bills.

The principal difference in barbarians consisted in physical strength and courage.

The principal difference between the two species is in the cocoon.

This is the principal difference between a dog and a man.

That is the principal difference between a dog and a man.

That's the principal difference, and you'll never get over it.

The principal difference betwixt the Cameronians and the rational presbyterians has been already touched upon.

There are several varieties, which are much alike, the principal difference being in the nuts.

But the principal difference was our want of fire.

The principal difference with the Old Masters is that the lead character is a woman.

Soil undoubtedly makes the principal difference in the blades that spring up, but probably not all.

The principal difference between the two was in their views as to the succession to the throne.

The principal difference between them is that the former keep the horse and the latter the reindeer.

By then, however, Hasselbaink had done enough and his marksmanship was the principal difference between the teams.

The principal difference was in his expression.

The principal difference between a cat and a lie is that the cat has only nine lives.