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

Whence comes this man with his new poetry, which confounds the critics? and that man with his subtile wit borrowed from no school?

From A Breeze from the Woods, 2nd Ed. by William Chauncey Bartlett

Gage Well said, but will this subtile reasoning stand?

From The Poems of Philip Freneau, Volume I (of III) by Philip Freneau

Any subtile, invisible emanation, effluvium, or exhalation from a substance, as the aroma of flowers, the odor of the blood, a supposed fertilizing emanation from the pollen of flowers, etc.

From Webster's Unabridged Dictionary (2nd 100 Pages) by Noah Webster

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

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

Bread is a binder, and for that abolisht even in their Ale, whose lost room fills an apple, which is more airy and of subtiler nature.

From The Scornful Lady by John Fletcher

What if, through communication with subtiler organisms than my own, I could reach at a single bound the goal, which perhaps a life of agonizing mental toil would never enable me to attain?

From The Atlantic Monthly, Volume 01, No. 03, January, 1858 by Various

No, his temperament needed a subtiler atmosphere than this, rarer essence than mere brutal freedom.

From The Atlantic Monthly, Volume 08, No. 50, December, 1861 by Various

In such spaces he may dream his dreams, tell his stories, and stamp on them for centuries his subtilest and divinest thoughts.

From Scientific American Supplement, No. 799, April 25, 1891 by Various

This is a truth that takes all the sting out of Lord Bacon's observation that "against Atheists the very savages take part with the very subtilest philosophers."

From Flowers of Freethought (Second Series) by G. W. (George William) Foote

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

I can say, from an experience of over a dozen years, that pupils between twelve and fifteen years of age are immensely interested in such discussions, and are capable of making the subtilest distinctions.

From The Moral Instruction of Children by Felix Adler

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