Besides the Aryan and Semitic families of religion, we have in China three recognised forms of public worship, the religion of Confucius, that of Lao-tse, and that of Fo (Buddha); and here, too, recent publications have shed new light, and have rendered an access to the canonical works of these religions, and an understanding of their various purports, more easy, even to those who have not mastered the intricacies of the Chinese language. Among the Turanian nations, a few only, such as the Finns, and the Mongolians, have preserved some remnants of their ancient worship and mythology, and these too have lately been more carefully collected and explained by d'Ohson, Castrèn, and others. In America the religions of Mexico and Peru had long attracted the attention of theologians; and of late years the impulse imparted to ethnological researches has induced travellers and missionaries to record any traces of religious life that could be discovered among the savage inhabitants of Africa, America, and the Polynesian islands. It will be seen from these few indications, that there is no lack of materials for the student of religion; but we shall also perceive how difficult it is to master such vast materials. To gain a full knowledge of the Veda, or the Zend-Avesta, or the Tripi_t_aka, of the Old Testament, the Koran, or the sacred books of China, is the work of a whole life. How then is one man to survey the whole field of religious thought, to classify the religions of the world according to definite and permanent criteria, and to describe their characteristic features with a sure and discriminating hand? Nothing is more difficult to seize than the salient features, the traits that constitute the permanent expression and real character of a religion. Religion seems to be the common property of a large community, and yet it not only varies in numerous sects, as language does in its dialects, but it really escapes our firm grasp till we can trace it to its real habitat, the heart of one true believer. We speak glibly of Buddhism and Brahmanism, forgetting that we are generalizing on the most intimate convictions of millions and millions of human souls, divided by half the world and by thousands of years. It may be said that at all events where a religion possesses canonical books, or a definite number of articles, the task of the student of religion becomes easier, and this, no doubt, is true to a certain extent. But even then we know that the interpretation of these canonical books varies, so much so that sects appealing to the same revealed authorities, as, for instance, the founders of the Vedânta and the Sânkhya systems, accuse each other of error, if not of wilful error or heresy. Articles too, though drawn up with a view to define the principal doctrines of a religion, lose much of their historical value by the treatment they receive from subsequent schools; and they are frequently silent on the very points which make religion what it is.