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

Not by any altruistic agency we may be certain, as we watch the selfish, irritable little beings, but by subtile scent, or as with the vultures, by the jealous watching of each other's actions.

From Jungle Peace by William Beebe

The subtile philosophy of the Greeks was now brought into contact with the sublime but corrupted theology of the Persians, and the mysticism of India secretly mingled itself with the mass of knowledge.

From Secret Societies of the Middle Ages by Thomas Keightley

One seeks to accommodate one's self to her doctrine through subtile distinctions.

From The Catholic World; Volume I, Issues 1-6 A Monthly Eclectic Magazine by E. Rameur

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

That cause of motion he makes the Materia Subtilis; and the finer or subtiler that is, the better and fitter he conceives it to be to preserve Motion.

From Philosophical Transactions of the Royal Society - Vol 1 - 1666 Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World by Henry Oldenburg

The heavens change by a subtiler movement than the precession of the equinoxes.

From The Atlantic Monthly, Volume 04, No. 23, September, 1859 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

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

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

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

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

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

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