The scene dwelt in my mind for many days, and aroused in me a strange train of thought; these dim vegetable forms, with their rich luxuriance, their sinister beauty, awoke a curious repugnance in the mind. They seemed unholy and evil. And yet it is all part of the life of nature; it is just as natural, just as beautiful to find life at work in this gloomy and unvisited place, wreathing the bare walls with these dark, soft fabrics. It was impossible not to feel that there was a certain joy of life in these growths, sprouting with such security and luxuriance in a place so precisely adapted to their well-being; and yet there was the shadow of death and darkness about them, to us whose home is the free air and the sun. It seemed to me to make a curious parable of the baffling mystery of evil, the luxuriant growth of sin in the dark soul. I have always felt that the reason why the mystery of evil is so baffling is because we so resolutely think of evil as of something inimical to the nature of God; and yet evil must derive its vitality from him. The one thing that it is impossible to believe is that, in a world ruled by an all-powerful God, anything should come into existence which is in opposition to his Will. It is impossible to arrive at any solution of the difficulty, unless we either adopt the belief that God is not all-powerful, and that there is a real dualism in nature, two powers in eternal opposition; or else realise that evil is in some way a manifestation of God. If we adopt the first theory, we may conceive of the stationary tendency in nature, its inertness, the force that tends to bring motion to a standstill, as one power, the power of Death; and we may conceive of all motion and force as the other power, the quickening spirit, the power of life. But even here we are met with a difficulty, for when we try to transfer this dualism to the region of humanity, we see that in the phenomena of disease we are confronted, not with inertness fighting against motion, but with one kind of life, which is inimical to human life, fighting with another kind of life which is favourable to health. I mean that when a fever or a cancer lays hold of a human frame, it is nothing but the lodging inside the body of a bacterial and an infusorial life which fights against the healthy native life of the human organism. There must be, I will not say a consciousness, but a sense of triumphant life, in the cancer which feeds upon the limb, in spite of all efforts to dislodge it; and it is impossible to me to believe that the vitality of those parasitical organisms, which prey upon the human frame, is not derived from the vital impulse of God. We, who live in the free air and the sun, have a way of thinking and speaking as if the plants and animals which develop under the same conditions were of a healthy type, while the organisms which flourish in decay and darkness, such as the fungi of which I saw so strange an example, the larva; which prey on