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

According to these notions, there existed a volatile principle that bore no specific name, but was diffused through every part of living bodies, more subtile than heat, air, or vapour.

From Curiosities of Medical Experience by J. G. (John Gideon) Millingen

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

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

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

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

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

Truth is a point; the subtilest and finest; harder than adamant; never to be broken, worn away, or blunted.

From Imaginary Conversations and Poems A Selection by Walter Savage Landor

Said to us, during the past season, the subtilest thinker of Great Britain,—"I must send to America whatever I wish to put in print, unless I pay for its publication from my own pocket."

From The Atlantic Monthly, Volume 02, No. 12, October, 1858 by Various

The notion of nonentity may thus be called the parent of the philosophic craving in its subtilest and profoundest sense.

From The Will to Believe : and Other Essays in Popular Philosophy by William James

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

At some far-away period in childhood it got imbedded in my fancy, and in process of time had acquired that subtilest, indefinable fascination which belongs only to imaginative reminiscence.

From The Atlantic Monthly, Volume 15, No. 88, February, 1865 by Various