_But why is it that we do not return to the old-established religions? It is because, alas, the Great Agony through which the world has passed has not dealt kindly with any form of established faith. Dogmatic theology, which admits and exalts the direct interference of the divinity in our affairs, has received some serious wounds. The useless and unjustifiable sacrifice of so many innocent lives, of women, of old men, of children, left us deeply perplexed. We could not grasp the reason for so much suffering. Never, at any period in the past, have the enemies of humanity and of God so blasphemed against the eternal principles of the universe--yet how was it that the authors of such crimes went unpunished?_ _Agonising doubts seized upon many faithful hearts, and amid all the misery with which our planet was filled we seemed to distinguish a creeping paralysis of the established faiths. Just at the time when we most had need of religion, it seemed to weaken and vanish from our sight, though we knew that human life, when not enriched and ennobled by spiritual forces, sinks into abysmal depths, and that even any diminution in the strength of these forces is fatally injurious to our most sacred and essential interests._ _Attempts to revive our faith were bound to be made sooner or later, and we shall no doubt yet witness innumerable pilgrimages towards the source of religion._ _The psychology of the foundations of the spiritual life; the mysterious motives which draw men towards, or alienate them from, religious leaders; the secret of the influence exercised by these latter upon mankind in the mass--all these things are now and always of intense interest. Through the examination of every kind of disease, the science of medicine discovers the laws of health; and through studying many religions and their followers we may likewise arrive at a synthesis of a sane and wholesome faith. The ever-increasing numbers of strange and attractive places of worship which are springing up in all countries bear witness to man's invincible need to find shelter behind immediate certainties, even as their elaborate outer forms reflect the variety of his inward aspirations._ _In the great forest of ecstasies and illusions which supplies spiritual nourishment to so many of our fellow-humans, we have here confined ourselves to the examination of the most picturesque and unusual plants, and have gathered them for preference in the soil of Russia and of the United States. These two countries, though in many respects further apart than the Antipodes, furnish us with characteristic examples of the thirst for renewal of faith which rages equally in the simple soul of an uncultured peasant and in that of a business man weary of the artificialities of modern life._