[1] The first volume of Sigwart's principal work, Logik, was published in 1873 and took an important place among contributions to logical theory in the late nineteenth century.

[1] The Logik represents the results of a long and careful study not only of German but also of English logicians.

Chapter 5 of the second volume is especially interesting to English thinkers as it contains a profound examination of the induction theories of Francis Bacon, John Stuart Mill and David Hume.

[2] No amount of failure in the attempt to subject the world of sensible experience to a thorough-going system of conceptions, and to bring all happenings back to cases of immutably valid law, is able to shake our faith in the rightness of our principles.

We hold fast to our demand that even the greatest apparent confusion must sooner or later solve itself in transparent formulas.