The Essays in this volume, as will be apparent, have all of them had an occasional origin. They bear evident traces of particular controversy and contain much criticism of authors who are hardly, if at all, known in this country. Their author thought it worth while to collect them in one volume and it has been, I am sure, worth while to have them translated into English, because though written on different occasions and in different controversies they have all the same purpose. They are an attempt to make clear by philosophical criticism the real purpose and value of Marx's work
