I regard the mind as an organism, capable of anatomical examination, as the body is, but of course by very different means. In the anatomical examination of an animal organism we use our eye-sight to acquire a knowledge of its component parts, its organs, and its structure, by dissection of a dead or inspection of a living subject. But, in studying the anatomy of mind, we have a subject that is beyond our visual perception. It is not, however, beyond our examination. We carry on that examination by means of the introspection which consciousness enables us to have of our own minds, and by observing and comparing the phenomena of mind as manifested in other persons. If these respective means of investigation enable us to reach the conviction that in each individual of the human race there is an existence of a spiritual nature and another existence of a corporeal or physical nature, we shall have attained this conclusion by observing the difference between the two organisms. The fact that we can not detect the bond that unites them while they are united should not lead us to doubt their distinct existence as organisms of different natures, but made for a temporary period to act on and with each other.

Before entering further into the subject, I will refer to some of the terms which we are obliged to use in speaking of the nature of mind as an organism, when contrasted with the nature of the physical organism. We speak, for example, and from the want of another term we are obliged to speak, of the substance of mind. But, while we thus speak of mind in a term of matter, there is no implication that the subject of which we speak is of the same nature as that which constitutes the physical organism; nor is there any danger of the incorporation of materialistic ideas with our ideas of the fabric of mind. On the contrary, the very nature of the inquiry is whether that which constitutes mind is something different from that which constitutes body; and, although in speaking of both we use the term substance, we mean in the one case organized matter, and in the other case organized spirit. There is a very notable instance of a corresponding use of terms in the passage of one of St. Paul's epistles, where he discourses on the doctrine of the resurrection. According to my universal custom when I refer to any of the writings regarded by the Christian world as sacred, or inspired, I lay aside altogether the idea of a person speaking by divine or any other authority. I cite the statement of St. Paul, in its philosophical aspect, as an instance of the use of the term body applied to each of the distinct organisms. His statement, or assertion, or assumption—call it what you please—is, "If there is a natural body, there is also a spiritual body";[139] he uses the term body in speaking of that which is natural, or of the earth, earthy, and of that which is spiritual, or heavenly. Without following him into the nature of the occurrence which he affirms is to take place in the resurrection, the question is whether he was or was not philosophically correct, in speaking of two kinds of organisms, one composed of matter, and liable to corruption and dissolution, and the other composed of spirit, indestructible and imperishable.

In order to be understood, he was obliged to use the term body in reference to both of these organisms, just as we are obliged to use the term substance when we speak of the subject of contemplation as a physical or as a spiritual organism. Can this distinctness of nature be predicated of the body and the mind of man before what we call death?

The peculiar occurrence which St. Paul so vigorously and vividly describes as what is to happen at the resurrection, is a prophecy in which he mingles with great force philosophical illustrations and the information which he claims to have received from inspiration; or things revealed to him by the Almighty through the Holy Spirit. He expresses himself in terms level to the apprehension of those whom he is addressing; and in this use of terms he does just what we do when we speak of a natural body and a spiritual body. He puts the existence of the natural body hypothetically:

"If there is a natural body, there is also a spiritual body."[140] Paraphrased as the whole passage may be, he says, "You well know that there is a natural body, and I tell you that there is also a spiritual body." Laying aside the mode in which the spiritual body is to be manifested at and after the resurrection, we have to consider whether, during this life, there is a bodily organism and a mental organism, distinct in their natures, but united for a time by a bond which is hidden from our detection.

I have used the term anatomy of the mind, from the same necessity which compels me to speak of the substance of mind. You will understand that, when I speak of anatomical examination of the mind, I mean that analysis of its structure which we can make by the use of the appropriate means, and which enables us to conceive that it is an organized structure of a peculiar character.

The grand difficulty with Mr. Spencer's "Psychology" is, that after he has made what he calls "the proximate components of mind" to consist of "two broadly contrasted kinds—feelings and the relations between feelings," which are mere impressions produced on the nerve-center by molecular changes in the fluid or semi-fluid substance of the nerves, he has not approached to a solution of the question whether there is or is not a something to which these feelings and the relations between them suggest ideas, and which holds ideas continuously for future use.

Thus he makes consciousness to consist in passing groups of feelings and their relations, and not in a conscious subject. He denies that there is any ego, in the sense in which every person is conscious of a self, and maintains that the only substantive existence is the unknown ligament which holds together the ever-changing states of feelings and impressions produced in the nerve-center. There is a far better method of investigation. It is to inquire into the fabric of the mind as an organism, by determining whether mental phenomena justify us in the conclusion that it is an organism. In this way we may reach a satisfactory conclusion that the mind is a substantive existence, possessing a uniform structure, of a character, however, fundamentally different from the bodily structure; and in this way we may be able to explain, wholly or in part, how the mind and the body act on and with each other so long as the connection is maintained.

I am entirely free to acknowledge that, when I speak of the substance of mind, or speak of it as an organism, I am and must remain ignorant of the nature of its substance beyond the point where its self-manifestations cease. But the question is, whether we are not under an irresistible necessity of adopting as a postulate the existence of a something which has certain inherent powers, and whether the mental phenomena, the self-manifestations of those powers, do not necessarily lead us to the conception and conviction that mind is a substantive existence. I can not talk or think of consciousness apart from a conscious subject, or of feelings without a subject that feels. A thread of consciousness, or a series of feelings, conveys no meaning to me, apart from a being who has the consciousness and perceives the feelings.[141]