principal element

The Palm-tree is, in Egypt, as in all the oases, the principal element of the arborescent vegetation.

None: the development of this principal element of national existence is left to the ignorant and indolent peasantry.

The distinguishing characteristic of his life as a bishop was his insistence on poverty as the principal element of his existence.

The original and principal element is Anglo-Saxon, which prevailed in England for about five hundred years.

But of what value is the thing they call in Paris mind to a class whose principal element of happiness is virtue and good sense?