17.It may give them a permanent taste for what is abstruse and infinitely subtle — at the expense of anything that doesn't pass an exaggerated threshold of convolution.
18.Science solved a thousand and one various abstruse, complicated questions bearing on criminal law, but failed to give an answer to the question he had formed.
19.Whitehead's book, although it does not go very deeply into the more abstruse branches of the subject, is remarkably eloquent about the principles of mathematical reasoning.
20.What we say will often be applicable to the reading of specialized monographs on abstruse and limited subjects, but we cannot help you to read those.