The growing interest taken in philosophy in this country has led to the issue of the present volume of Bohn's Philosophical Library, containing the presenta tion for the first time to the British public of one work, important alike to the votary of physical science and of philosophy, and an entirely fresh translation of another which is absolutely indispensable at least to the philo sophical student of Kant. Only two English translations of the Prolegomena have hitherto been published. The first (a very bad one) by John Richardson, appeared in 1818, and has been out of print for many years past. The second (based on the last-mentioned) forms one of the volumes in Professor Mahafi'y's series entitled, Kant's Critical Philosophy for English Readers, and while avowedly a somewhat free rendering, conveys the sense of the original fairly well, but its relatively high price places it beyond the reach of many persons. The present translation aims at giving, as far as possible, the ips'issima verba of Kant. No attempt has been made to convert the cumbrous German of the original into elegant English. Even the form and length of the sentences have been retained wherever possible, as it has been thought preferable to place before the reader Kant himself, with all his lack of literary polish, rather than any mere paraphrase of Kant.