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accompanying actions activity adjustment amount animals answer arise association become blood body cause centres changes chapter clusters Co-existence co-ordination combination common complex compound connected consciousness constitute continuous contraction correspondence creatures direct discharge distinct distinguished disturbance effect elements emotions environment equal excited exist experiences external extreme fact feelings fibres follows force functions further given greater groups Hence higher ideas implies impressions increase internal involved kind known less light limited matter mental Mind molecular motion motion muscles muscular nature nerves nervous system objects observe occur organism outer pain particular pass phenomena physical portion positions present produced psychical quantity reached reason received relations relative remains respecting sensations sense sequences similarly simple sounds space structure subjective substance successive suppose things thought tion touch truth units unlike varies various visual wave