ABSTRACT
The author of this remarkable treatise on the Paradoxes of the Infinite began writing it as early as 1847, during his residence in the company of the Editor at the charming country house in Liboch, near Melnik, but was interrupted by tasks of a different nature and did not complete it until the summer months of the following year, the last of his life. The work not only gave evidence that his intellectual powers had lost nothing of their vigour and alertness, but also furnished the learned world with fresh proofs of the uncommon insight Bernard Bolzano enjoyed into the most abstract depths of mathematics, natural science and metaphysics. Upon receiving the manuscript of this treatise from the heirs of the author, the Editor undertook to have it printed as soon as possible, accepting this obligation all the more gladly in that it harmonised with his own inmost feelings; for Bolzano was his unforgettable teacher and friend.
