...Here the class was reciting a lesson from an abstruse text-book on economics, reciting it by rote, with so obvious a failure to assimilate it that the waste of labour was pitiful... 
Booker T. Washington 「Up From Slavery: An Autobiography」
...It was not a matter of argument,certainly not on abstruse points...
Major Gambier-Parry 「'Murphy'」
...In thisdiscussion of a perhaps abstruse and difficult theme, his indulgence issought for whatever imperfections or deficiencies may appear...
Alpheus Spring Packard 「Our Common Insects」
...How thoroughly he had mastered these, the most profound and abstruse metaphysicians that the West can boast, I cannot state...
Sidney L. Gulick 「Evolution Of The Japanese, Social And Psychic」
...The idea that certain mathematical proportions orrelationships underlie the phenomena we call beauty is veryancient, and too abstruse to trouble us here...
Harold Speed 「The Practice and Science Of Drawing」
...There never has been a seemingly more abstruse subject for the human mind to grasp than the theories involving a true conception of space-time...
Raymond King Cummings 「The White Invaders」
...The abstruse nature of the study, my inexperience and wantof means dispirited me...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...And how was the Principia received? Considering the abstruse nature ofits subject, it was received with great interest and enthusiasm...
Oliver Lodge 「Pioneers of Science」
...It is the work of genius to render difficultmatters plain, abstruse thoughts clear...
Henry Warren 「Recreations in Astronomy」
... Atheism, then, as well as philosophy, like all profound abstruse sciences, is not calculated for the vulgar; neither is it suitable to the great mass of mankind...
Paul Henri Thiery (Baron D'Holbach) Samuel Wilkinson 「The System of Nature, Volume 2」
...The telephone, the electric transmission of power,wireless telegraphy and the submarine cable are instances of immensefinancial returns derived from the most abstruse principles of physics...
Edward C. Pickering 「The Future of Astronomy」
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