In the _third place_, the savage, in opening the watch, and examining its parts, will perhaps feel, that this machinery announces a work which can only be the result of human labour. He will perhaps perceive, that they very obviously differ from the immediate productions of nature, whom he has not observed to produce wheels made of polished metal. He will further notice, perhaps, that these parts when separated, no longer act as they did when they were combined; that the motion he so much admired, ceases when their union is broken. After these observations, he will attribute the watch to the ingenuity of man; that is to say, to a being like himself, of whom he has some ideas, but whom he judges capable to construct machines to which he is himself utterly incompetent. In short, he will ascribe the honour of his watch to a being known to him in some respects, provided with faculties very far superior to his own; but he will be at an immense distance from the belief, that this material work, whose ingenuity pleases him so much, can be the effect of an immaterial cause; or of an agent destitute of organs, without extent; whose action upon material beings cannot be within, the sphere of his comprehension. Nevertheless, man, when he cannot embrace the causes of things, does not scruple to insist that they are impossible to be the production of nature, although he is entirely ignorant how far the powers of this nature extend; to what her capabilities are equal. In viewing the world, we must acknowledge material causes for many of those phenomena which take place in it; those who study nature are continually adding fresh discoveries to this list of physical causes; science, as she enriches the intellectual stores of human enjoyment, every day throws a broader light on the energies of nature, which _prejudice_, aided by its almost inseparable companion, _ignorance_, would for ever bind down in the fetters of impotence.