George Henry Lewes

From about 1853 Lewes's writings show that he was occupying himself with scientific and more particularly biological work. He always showed a distinctly scientific bent in his writings, though he had not had technical training. More than popular expositions of accepted scientific truths, they contain able criticisms of conventionally accepted ideas and embody the results of individual research and individual reflection. He made several suggestions, some of which have since been accepted by physiologists, of which the most valuable is that now known as the doctrine of the functional indifference of the nerves – that what were known as the specific energies of the optic, auditory and other nerves are simply differences in their mode of action due to the differences of the peripheral structures or sense-organs with which they are connected. This idea was subsequently proposed independently by Wundt.[4]

In 1865, when The Fortnightly Review began publication, Lewes became its editor, but he retained the post for less than two years, when he was succeeded by John Morley.

This marks the transition from more strictly scientific to philosophic work. Lewes had been interested in philosophy from early youth; one of his earliest essays was an appreciative account of Hegel's Aesthetics. Under the influence of the positivism of Auguste Comte and John Stuart Mill's A System of Logic, he abandoned all faith in the possibility of metaphysics, and recorded this abandonment in his History of Philosophy. Yet he did not at any time give unqualified assent to Comte's teachings, and with wider reading and reflection his mind moved further away from the positivist stance. In the preface to the third edition of his History of Philosophy he avowed a change in this direction, and this movement is even more plainly discernible in subsequent editions of the work.

The final outcome of his intellectual progress is The Problems of Life and Mind. His sudden death cut short the work, yet it is complete enough to allow a judgment on the author's matured conceptions on biological, psychological and metaphysical problems.

The first two volumes on The Foundations of a Creed laid down Lewes' foundation – a rapprochement between metaphysics and science. He was still positivist enough to pronounce all inquiry into the ultimate nature of things fruitless: what matter, form, and spirit are in themselves is a futile question that belongs to the sterile region of "metempirics". But philosophical questions may be susceptible to a precise solution through scientific method. Thus, since the relation of subject to object falls within our experience, it is a proper matter for philosophic investigation.

His treatment of the question of the relation of subject to object confused the scientific truth that mind and body coexist in the living organism and the philosophic truth that all knowledge of objects implies a knowing subject. In Shadworth Hodgson's phrase, he mixed up the genesis of mental forms with their nature (see Philosophy of Reflexion, ii. 40–58). Thus he reached a monistic doctrine that mind and matter are two aspects of the same existence by attending simply to the parallelism between psychical and physical processes as a given fact (or probable fact) of our experience, leaving out of account their relation as subject and object in the cognitive act.

His identification of the two as phases of one existence is open to criticism not only from the point of view of philosophy but from that of science. In his treatment of such ideas as "sensibility", "sentience" and the like, he does not always make it clear whether he is speaking of physical or of psychical phenomena. Among other philosophic questions discussed in these two volumes the nature of casual relation is perhaps the one which is handled with most freshness and suggestiveness.

The third volume, The Physical Basis of Mind, further develops the writer's views on organic activities as a whole. He insists on the radical distinction between organic and inorganic processes and the impossibility of explaining the former by purely mechanical principles. All parts of the nervous system have the same elementary property; sensibility. Thus sensibility belongs as much to the lower centres of the spinal cord as to the brain, the former, more elementary, form contributing to the subconscious region of mental life, while the higher functions of the nervous system, which make up our conscious mental life, are more complex modifications of this fundamental property of nerve substance.

The nervous organism acts as a whole, particular mental operations cannot be referred to definite regions of the brain, and the hypothesis of nervous activity by an isolated pathway from one nerve cell to another is altogether illusory. By insisting on the complete coincidence between the regions of nerve action and sentience, that these are but different aspects of one thing, he was able to attack the doctrine of animal and human automatism which affirms that feeling or consciousness is merely an incidental concomitant of nerve action in no way essential to the chain of physical events.

Lewes's views on psychology, partly explained in the earlier volumes of the Problems, are more fully worked out in the last two (3rd series). He discussed the method of psychology with much insight. Against Comte and his followers he claimed a place for introspection in psychological research. As well as this subjective method there must be an objective one, a reference to nervous conditions and socio-historical data. Biology would help explain mental functions such as feeling and thinking, it would not help us to understand differences of mental faculty in different races and stages of human development. The organic conditions of these differences will probably for ever escape detection, hence they can be explained only as the products of the social environment. The relationship of mental phenomena to social and historical conditions is probably Lewes's most important contribution to psychology.

He also emphasised the complexity of mental phenomena. Every mental state is regarded as compounded of three factors in different proportions – sensible affection, logical grouping and motor impulse. But Lewes's work in psychology consists less in discoveries than in method. His biological experience prepared him to view mind as a complex unity of which the highest processes are identical with and evolved out of the lower. Thus the operation of thought, or "the logic of signs", is a more complicated form of the elementary operations of sensation and instinct or "the logic of feeling".

The last volume of the Problems illustrates this position. It is a valuable repository of psychological facts, many of them drawn from obscure regions of mental life and from abnormal experience. To suggest and to stimulate the mind, rather than to supply it with any complete system of knowledge, may be said to be Lewes's service to philosophy. The exceptional rapidity and versatility of his intelligence seems to account at once for the freshness in his way of envisaging the subject matter of philosophy and psychology, and for the want of satisfactory elaboration and of systematic co-ordination.