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accompanying adjustment afferent nerves aggregate animals arise become blood body cause cerebellum cerebrum chapter cluster co-ordination colour combination complex compound connexions consciousness constitute contraction correspondence creatures degree distinguished disturbance effect efferent elements emotions environment evolution excited exist experiences external fact feelings fibres functions further ganglia ganglion grey matter groups Hence higher ideas implies impressions increase infer inner intelligence involved isomeric kind less manifest matter medulla oblongata mental Mind molecular change molecular motion molecules motor changes muscles muscular nascent nerve-centre nerve-fibres nervous action nervous centres nervous changes nervous discharge nervous structures nervous system nexions object organism outer relations pain pass perception phenomena plexuses present produced protoplasm psychical changes quantity reflex action rela relations of Co-existence retina riences sciousness sensations sequences similarly simultaneously space spinal cord stimuli substance successive tactual things tion tissue truth units vesicles viscera visual wave of molecular zoophytes