The brain as an organ of mind . we use the word organ merely in the sense that it is a part whose molecularchanges and activities, constitute the essential correlativesof those phases of Consciousness known as Sensations,Emotions, Thoughts, and Volitions, as well as of a con-siderable part of the sum total of those other relatednerve actions which are unattended by Consciousness, andwhose results form, in accordance with the views abovestated, so large a proportion of the phenomena compre-hended under the general abstract word Mind. From what has been already said, it will be seen thatthe stud
The brain as an organ of mind . we use the word organ merely in the sense that it is a part whose molecularchanges and activities, constitute the essential correlativesof those phases of Consciousness known as Sensations,Emotions, Thoughts, and Volitions, as well as of a con-siderable part of the sum total of those other relatednerve actions which are unattended by Consciousness, andwhose results form, in accordance with the views abovestated, so large a proportion of the phenomena compre-hended under the general abstract word Mind. From what has been already said, it will be seen thatthe study of mental phenomena has to be carried on inmany different directions, and that it is one which is besetwith peculiar difficulties. The following table or diagram Chap. X.] THE SCOPE OF MTND. 155 indicates the principal kinds of data which require to becombined, and more or less fused, in order to give birthto a legitimate Psychology or true science of Mind, ^^io^ o^ndClas,,^ ^*<!lteso/Co.^.,,,^;-^aS. c^ ^^ -^0%%^^ % ?^^^. v-se o^ .?^^ These three departments supply data almost equallyimportant. To neglect the facts supplied by Neurologywould be about as unreasonable as to dismiss the legitimatestudy of Subjective Psychology, and certainly is on nogrounds to ba defended by those who do not refuse toinclude the study of Objective Psychology—and are thuswilling to take account of the data obtainable as to theconscious states of animals and of human beings otherthan themselves. For, if a departure is once made fromthe sphere of the subjective, the data of Neurology mustbe admitted to constitute as important a division of thescience of Mind as those derived from Objective Psycho-logy—from which they differ more in degree than inkind. CHAPTER XI. REFLEX ACTION AND UNCONSCIOUS COGNITION. The nature of a Reflex Action has been already indicated,and tlie tissue elements usually concerned in such anelementary nervous operation have been described. Theyconsist of ingoing fibres c
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