only four years later than the Kritik der Reinen Vernunft, and consequently it dates from the period when, although he was sixty-one, the detrimental effect of old age on his intellect was not yet perceptible.

On the other hand, this is distinctly traceable in the Kritik der Praktischen Vernunft, which was published in 1788, or one year later than the unhappy remodelling of the Kritik der Reinen Vernunft in the second edition, whereby the latter, his immortal master-piece, was obviously marred. An analysis of this question is to be found in the preface to the new edition by Rosenkranz, from which my own investigation makes it impossible for me to dissent. The Kritik der Praktischen Vernunft contains in its essentials the same material as the above-mentioned — Grundlegung; only the