subtile

Recent scientific discoveries have conferred upon man new powers of investigation, whereby nature has been made to reveal secrets so subtile that they never had been dreamt of before in philosophy.

From Scientific American ● Jan. 13, 2013

At Paris the Universe is seen, compos’d of Vortices of subtile Matter; but nothing like it is seen in London.

From "The Invention of Science" by David Wootton

Man's daintiest care, & caution cannot spy The subtile point of his coy destiny, Wch way it threats.

From The Complete Works of Richard Crashaw, Volume I (of 2) by Richard Crashaw

Nor wanting was the choral song, Swelling in silvery chimes of sweetness; To sound of which this subtile throng Advanced in playful grace and fleetness.

From Fairy Legends and Traditions of The South of Ireland by T. Crofton Crocker

And thus it is that the work of creation has neither beginning nor ending, but is ever progressing in its subtile methods of combining, dissolving, and recombining the entire matter of the universe.

From Nature and Culture by Harvey Rice

We rather think that far subtiler things than the doctrine of association had from of old been familiar to him.

From Life of Robert Burns by Thomas Carlyle

Is not the Heat of the warm Room convey'd through the Vacuum by the Vibrations of a much subtiler Medium than Air, which after the Air was drawn out remained in the Vacuum?

From Opticks or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light by Sir Isaac Newton

Gradually he wove a drama round it; line by line it took shape for a book that was to be subtiler, finer and more sincere than anything that he had ever written.

From The Education of Eric Lane by Stephen McKenna

The Reflexion must have rather been caused by a subtiler Medium, which could recede through the Glasses at the creeping in of the Water.

From Opticks or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light by Sir Isaac Newton

Something keener than philosophy, subtiler than Epicurus, pricked Fred, as Minnie vanished into the cloud of snowflakes.

From The Atlantic Monthly, Volume 03, No. 18, April, 1859 by Various

What stuff is the man made of who is not coexistent in our thought with the purest and subtilest truth?

From The Atlantic Monthly, Volume 12, No. 72, October, 1863 by Various

As for me, Abraham, Isaac, and Jacob are now only the subtilest imaginable essences, which would not stain the morning sky.

From A Week on the Concord and Merrimack Rivers by Henry David Thoreau

It was this mastery of the interior life, this impassioned voicing of its subtilest secrets, that made Rousseau so irresistibly attractive to women.

From The Friendships of Women by William Rounseville Alger

A book might be written on the Stratagems of Literature, as Frontinus has composed one on War, and among its subtilest heroes we might place this great poet.

From Calamities and Quarrels of Authors by Isaac Disraeli

But if you watch it attentively, you will find it ever changing, though with subtilest refinement, ever human, and true to the great laws of emotion.

From The Atlantic Monthly, Volume 07, No. 44, June, 1861 Creator by Various