One of the most marked sings of the times is the close attention that is being paid to psychological research, the results of which are being followed with the grates interest by an intelligent public, and the continued advanced of which promises to be one of the most hopeful activites of modern science. The observation, analysis, and classification of mental phenomena are being pursued with untiring energy, and the problem of mind attached on all side with refreshing vigour. In brief, the new science of psychology seems to promise at no distant date to become one of the most fruitful, if not the most fruitful, field of human tillage. But turn where we will to our manuals or special studies, we find no reference to the patient work of many centuries accomplished by the introspective genius of the East. In this field none have laboured with greater industry and acumen than the Buddhist thinkers, whose whole philosophy and therewith also their religion rests on a psychological basis. Not only so, but some of their main contentions are very similar to the later views advanced by the dominant schools of modern research. The work of these profound analysts of the nature of mind should, therefore, by no means be neglected by modern psychologists and those who are interested in their instructive-labours and who that desires to know himself can fail to be so interested? It must, however, be admitted that there is some excuse or previous neglect owing to the lack of books designed to smooth the way for those unacquainted with Oriental studies. It is with the hope of making a start in this direction that the present valuable introduction has been secured form the pen of one who is acknowledged to be the most competent student of the subject in the West.