A remarkable instance of communication between spirits at the moment of death is recorded in the Life of the Rev. Joseph S. Buckminster, written by his sister. When he was dying in Boston, their father was dying in Vermont, ignorant of his son's illness. Early in the morning, he said to his wife, "My son Joseph is dead." She told him he had been dreaming. He calmly replied, "I have not slept, nor dreamed. He is dead." When letters arrived from Boston, they announced that the spirit of the son had departed from his body the same night that the father received an impression of it. Such incidents suggest curious psychological inquiries, which I think have attracted less attention than they deserve. It is common to explain all such phenomena as "optical illusions" produced by "disordered nerves." But _is_ that any explanation? _How_ do certain states of the nerves produce visions as distinct as material forms? In the two cases I have mentioned, there was no disorder of the nerves, no derangement of health, no disquietude of mind. Similar accounts come to us from all nations, and from the remotest periods of time; and I doubt whether there ever was a universal superstition that had not some great, unchangeable truth for its basis. Some secret laws of our being are wrapt up in these occasional mysteries, and in the course of the world's progress we may perhaps become familiar with the explanation, and find genuine philosophy under the mask of superstition. When any well-authenticated incidents of this kind are related, it is a very common inquiry, "What are such visions sent _for_?" The question implies a supposition of miraculous power, exerted for a temporary and special purpose. But would it not be more rational to believe that all appearances, whether spiritual or material, are caused by the operation of universal laws, manifested under varying circumstances? In the infancy of the world, it was the general tendency of the human mind to consider all occasional phenomena as direct interventions of the gods, for some special purpose at the time. Thus, the rainbow was supposed to be a celestial road, made to accommodate the swift messenger of the gods, when she was sent on an errand, and withdrawn as soon as she had done with it. We now know that the laws of the refraction and reflection of light produce the radiant iris, and that it will always appear whenever drops of water in the air present themselves to the sun's rays in a suitable position. Knowing this, we have ceased to ask what the rainbow appears _for_.