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absorption acid action acts already alteration animals appears applied arteries attended becomes blood body bones brain called capillaries carbonic cause certain changes chiefly circulation circumstances common connected consequence considered consists contained continued contractions dependent direction disease distinct doubt easily effect effort emotions especially essential evidence excited existence experiments external facts feelings felt fibres fluid formed functions give greater heart human immediately important impressions increased indicate individual inflammation influence injury instinctive irritation kind laws less living lower lungs matter means membrane mental mind motion move movements muscles muscular natural nearly necessary nerves Nervous System objects observed organs origin particularly pass phenomena physical placenta portion principles probably produced quantity reason referred regard remedies result secretion seen sensations sense separate skin solid spinal cord stomach substance sufficient surface take place textures thought tion usual various veins vessels vital voluntary whole
Page 167 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 187 - That our thoughts and sensations must have a subject, which we call ourself, is not therefore an opinion got by reasoning, but a natural principle. That our sensations of touch indicate something external, extended, figured, hard, or soft, is not a deduction of reason, but a natural principle. The belief of it, and the very conception of it, are equally parts of our constitution. If we are deceived in it, we are deceived by him that made us, and there is no remedy.
Page 191 - We perceive two, or more objects — this is one state of the mind. We are struck with the feeling of their resemblance in certain respects. This is a second state of the mind. We then, in the third stage, give a name to these circumstances of felt resemblance, a name which is, of course, applied afterwards only where this relation of similarity is felt.
Page 162 - a decisive proof of this being the true representation of this part of our mental constitution, is obtained by attending to the idea of extension or space; which is undoubtedly formed during the exercise of the sense of touch; and is no sooner formed than it 'swells in the human mind to Infinity,' to which certainly no human sensation can bear any resemblance.
Page 125 - ... required, not in order that sensations may be felt, but that they may be remembered, and availed of for useful purposes, — not in order that volitions may act as stimuli on muscles, but that they may be so excited, and so succeed one another, as to produce regular and useful voluntary actions, under the guidance of desires, and of judgment and experience, as distinguished from blind instinct.
Page 140 - whatever be the conditions under which the nerves of the stomach become the seat of these sensations, it is certain that, in the healthy state, they are a true index, not only to the state of the stomach, but to the immediate wants of the system at large.
Page 123 - Alison, concluded that it is satisfactorily ascertained that no point of the brain, higher than the corpora quadrigemina nor of the cerebellum is essentially concerned in sensation.
Page 111 - ... without the intervention of those processes by which we observe material changes external to our minds; but we judge of them in others, only by inferences founded on the actions to which they give rise, when compared with our own. When we speak of sensation, thought, emotion, or volition, therefore, as functions of the Nervous System, we mean only that this system furnishes the conditions under which they take place in the living body...