Originally published in 1921, this volume represents De Ruggiero's first appearance in English, being the first time his philosophical works were translated. Modern Philosophy presents a positive philosophical position of great interest, avowedly in continuation of Croce and in close agreement with Gentile, which sums up the progress of Italian idealism down to the writing of this book. It is a remarkable piece of historical work, focusing on the development of European philosophy in the second half of the nineteenth century and the beginning of the twentieth, and was the first volume to comprehensively handle this time period.