Meanings of circumvolution in English

Never did a monarch hold so steadfastly to a deadly purpose, or proceed so languidly and with so much circumvolution to his goal.

Tell me, then, for you can, in what periphrasis of language, in what circumvolution of phrase, I shall envelope, yet not conceal, the plain story.

This "Ariadne's thread" easily follows all sinuosities, and adapts itself to all circumvolutions.