On the Ethics of Naturalism

by W. R. Sorley

CHAPTER V.
THE THEORY OF EVOLUTION AND THE DEVELOPMENT OF MORALITY.

1. General characteristics of the theory of evolution:

To relinquish the individualistic theory of ethics does not necessarily imply a recourse to evolution. It may still be possible to rest the foundation of ethics on the state, without that view of the growth of the community and of its connection with the individual which the theory of evolution involves. This, as has already been pointed out, was, in part, what Bentham did; while an attempt—in some respects more elaborate still—to deduce morality from society was made by Hobbes. The theory of Bentham, and of his successor Professor Bain, is indeed partly individualistic, partly social.[106] In the former reference, ethics becomes a theory of prudence; in the latter, a part of legislation. With Hobbes, on the other hand, the identification of individual and social interests is supposed to be brought about by the absolute necessity, in order to personal security, of a supreme political power, into the hands of which all men have agreed to transfer their rights to all things. But both Hobbes and Professor Bain might have avoided obvious difficulties had they had the theory of evolution to assist them, and had they thought themselves justified in making use of it.[107] For want of it the former has to explain morality and its binding force by means of the fiction of an "original contract"; while the latter has to account by the associations of a few years for the harmony of feeling between the individual and the whole, and for the good of the community coming to be so faithfully reflected in the consciences of its members. The theory of evolution, by its doctrine of the hereditary transmission of acquired modifications, gives a scientific basis for this existing solidarity between man and society.

The great consensus of opinion amongst those who are best qualified to judge—amongst those who alone are qualified to judge—may be regarded as having established the claim of the theory of evolution to give the most satisfactory account of all forms of natural life. And it may seem only advancing the theory a step further, or only developing one of its applications, to make it yield a complete explanation of human nature, mental as well as physical. If ethics, then, is to be founded on a "natural" basis, no theory would seem to be complete which leaves evolution out of account.

an assertion of the unity of life;

In general, the theory of evolution is an assertion of the unity of life, or, in its widest form, of the unity of existence. Progressive modifications and hereditary transmission of such modifications are, it is contended, sufficient to explain the different forms and species which life now manifests. The assumption is specially discarded that there are fixed differences between kinds of living things making it impossible for them all to have developed from simple germs, originally of like constitution, which have, in the course of time, become more heterogeneous and complex, and so given rise to the wealth of organic life. But this general doctrine, held (wholly or in part) in modern times by Kant, Wolff, and Lamarck, needed to be supplemented by a definite view of the way in which the progressive modifications took place; and this required to be established as a really operative cause, before evolution could receive scientific proof. This more special element of the theory was Darwin's contribution to the subject. Evolution, he showed,—and herein consists his theoretical advance on Lamarck,—has taken place by the "natural selection" of organisms, so modified as to fit them for survival in the struggle for existence. Organisms in which advantageous modifications have been produced tend to survive, and to transmit their modified structure to descendants, while organisms in which such modifications have not been produced, are less able to preserve their life and to hand it on to successors. Older types, it is true, remain, but only in circumstances in which their continued existence does not seriously interfere with the organisms which, in the struggle for life, have developed a structure better suited to their environment: when more perfect and less perfect forms cannot exist together, only the better adapted survive.

in first instance, historical;

The theory of evolution is thus primarily the history of an order of sequent facts and relations. It is an account of the origin or growth of things, which attempts to explain their nature and constitution by showing how they have come to be what they are. But, in so doing, it naturally reveals the method and tendency of this order. |but implies a teleological aspect, which may have ethical consequences.| And it is by means of this its teleological aspect that we see how it may be possible for it not merely to trace the development of historical facts, such as the feelings and customs of men, but at the same time to make a more real contribution to ethics by pointing out the course of action to which human nature is adapted. It does not, like the old teleology, attempt to show that each thing has been formed with the design of subserving some particular purpose. On the contrary, it reverses this way of looking at things. The fitness of an organism to fulfil any definite end comes to be regarded as the result not of a conscious design, independent of the environment, but of the modifications produced on the organism through the necessity laid upon it by its surroundings of adapting itself to them or else disappearing. What the theory does show is, that adaptation to environment is necessary for life, and that organisms unable to adapt themselves pass away. Adaptation to environment will thus be implied in, or be an essential means towards, self-preservation and race-preservation, self-development and race-development. And should this preservation or development be looked upon as the end of conduct, the adaptation to environment it implies may help to define and characterise the end.

Again: when an organism adapts itself to its environment, it does so by some modification being produced in its structure corresponding to the modified function required by the conditions of life. In this way, one organism increases in complexity in a certain direction, while another organism, in different circumstances, also develops a more complicated structure, though one of a different kind. Thus organisms, alike to begin with, become heterogeneous in nature through exposure to different surroundings. At the same time, by constant interaction with their environments, they become more definite and coherent in structure. Incipient modifications are developed and defined in different ways by different circumstances, and the parts of a living being are brought into closer reciprocal relations, and thus welded into a coherent organic whole. This is what Mr Spencer means when he says that evolution implies a transition from "an indefinite incoherent homogeneity to a definite coherent heterogeneity":[108] the whole process being interconnected in such a way that these different aspects of it—definiteness, coherence, heterogeneity—increase together and imply one another. By this the inference would appear to be suggested that, if conduct is to harmonise with the conditions of evolution, this characteristic feature of it must be recognised in the ethical end.