In rising to this conception of its task, the science of religion is only obeying the impulse which dominates every department of study in modern times. What every science is doing is to seek to show the unity of law amid the multiplicity of the phenomena with which it has to deal, to gather up the many into one, or rather to show how the one has given rise to the many. In the study of religion, if it be really a science, this impulse of all science must surely be felt. Here also we must cherish the conviction that an order does exist amid the apparent disorder, if we could but find it. We must believe that the religious beliefs and practices of mankind are not a mere chaos, not a mere incessant outburst of unreason, consistent only in that it has appeared in every age and every country of the world, but that they form a cosmos, and may be known, if we take the right way, as a part of human life from which reason has never been absent, and in which a growing purpose has fulfilled and still fulfils itself. Some theories, it is true, from which the world formerly hoped much, are not now relied on, and the present tendency is to abstain from any general doctrine of the subject, and to be content with careful collection and arrangement of the facts in special parts of the field. Caution is no doubt most needful in the attempt to form a view of this great study as a whole. Yet something of this kind is possible, and is beyond all doubt much called for. It is the aim of this little work not only to describe the leading features of the great religions, but also to set forth some of the results which appear to have been reached regarding the relation in which these systems stand to each other.