of using them. The point of inquiry is the changes which have taken place in the secondary postulates involved in the scientific point of view—in great part a question of the progressive redistribution of emphasis among the preconceptions under whose guidance successive generations of scientists have gone to their work.
The sciences which are in any peculiar sense modern take as an (unavowed) postulate the fact of consecutive change. Their inquiry always centers upon some manner of process. This notion of process about which the researches of modern science cluster, is a notion of a sequence, or complex, of consecutive change in which the nexus of the sequence, that by virtue of which the change inquired into is consecutive, is the relation of cause and effect. The consecution, moreover, runs in terms of persistence of quantity or of force. In so far as the science is of a modern complexion, in so far as it is not of the nature of taxonomy simply, the inquiry converges upon a matter of process; and it comes to rest, provisionally, when it has disposed of its facts in terms of process. But modern scientific inquiry in any case comes to rest only provisionally; because its prime postulate is that of consecutive change, and consecutive change can, of course, not come to rest except provisionally. By its own nature the inquiry cannot reach a final term in any direction. So it is something of a homiletical commonplace to say that the outcome of any serious research can only be to make two questions grow where one question grew before. Such is necessarily the case because the postulate of the scientist is that things change consecutively. It is an unproven and unprovable postulate—that is to say, it is a metaphysical preconception—but it gives the outcome that every goal of research is necessarily a point of departure; every term is transitional.[2]
A hundred years ago, or even fifty years ago, scientific men were not in the habit of looking at the matter in this way. At least it did not then seem a matter of course, lying in the nature of things, that scientific inquiry could not reach a final term in any direction. To-day it is a matter of course, and will be so avowed without argument. Stated in the broadest terms, this is the substantial outcome of that nineteenth-century movement in science with which the name of Darwin is associated as a catch-word.
This use of Darwin's name does not imply that this epoch of science is mainly Darwin's work. What merit may belong to Darwin, specifically, in these premises, is a question which need not detain the argument. He may, by way of creative initiative, have had more or less to do with shaping the course of things scientific. Or, if you choose, his voice may even be taken as only one of the noises which the wheels of civilisation make when they go round. But by scientifically colloquial usage we have come to speak of pre-Darwinian and post-Darwinian science, and to appreciate that there is a significant difference in the point of view between the scientific era which preceded and that which followed the epoch to which his name belongs.
Before that epoch the animus of a science was, on the whole, the animus of taxonomy; the consistent end of scientific inquiry was definition and classification—as it still continues to be in such fields of science as have not been affected by the modern notion of consecutive change. The scientists of that era looked to a final term, a consummation of the changes which provoked their inquiry, as well as to a first beginning of the matters with which their researches were concerned. The questions of science were directed to the problem, essentially classificatory, of how things had been in the presumed primordial stable equilibrium out of which they, putatively, had come, and how they should be in the definitive state of settlement into which things were to fall as the outcome of the play of forces which intervened between this primordial and the definitive stable equilibrium. To the pre-Darwinian taxonomists the center of interest and attention, to which all scientific inquiry must legitimately converge, was the body of natural laws governing phenomena under the rule of causation. These natural laws were of the nature of rules of the game of causation. They formulated the immutable relations in which things "naturally" stood to one another before causal disturbance took place between them, the orderly unfolding of the complement of causes involved in the transition over this interval of transient activity, and the settled relations that would supervene when the disturbance had passed and the transition from cause to effect had been consummated—the emphasis falling on the consummation.
The characteristic feature by which post-Darwinian science is contrasted with what went before is a new distribution of emphasis, whereby the process of causation, the interval of instability and transition between initial cause and definitive effect, has come to take the first place in the inquiry; instead of that consummation in which causal effect was once presumed to come to rest. This change of the point of view was, of course, not abrupt or catastrophic. But it has latterly gone so far that modern science is becoming substantially a theory of the process of consecutive change, which is taken as a sequence of cumulative change, realized to be self-continuing or self-propagating and to have no final term. Questions of a primordial beginning and a definitive outcome have fallen into abeyance within the modern sciences, and such questions are in a fair way to lose all claim to consideration at the hands of the scientists. Modern science is ceasing to occupy itself with the natural laws—the codified rules of the game of causation—and is concerning itself wholly with what has taken place and what is taking place.
Rightly seen from this ultra-modern point of view, this modern science and this point of view which it affects are, of course, a feature of the current cultural situation—of the process of life as it runs along under our eyes. So also, when seen from this scientific point of view, it is a matter of course that any marked cultural era will have its own characteristic attitude and animus toward matters of knowledge, will bring under inquiry such questions of knowledge as lie within its peculiar range of interest, and will seek answers to these questions only in terms that are consonant with the habits of thought current at the time. That is to say, science and the scientific point of view will vary characteristically in response to those variations in the prevalent habits of thought which constitute the sequence of cultural development; the current science and the current scientific point of view, the knowledge sought and the manner of seeking it, are a product of the cultural growth. Perhaps it would all be better characterised as a by-product of the cultured growth.
This question of a scientific point of view, of a particular attitude and animus in matters of knowledge, is a question of the formation of habits of thought; and habits of thought are an outcome of habits of life. A scientific point of view is a consensus of habits of thought current in the community, and the scientist is constrained to believe that this consensus is formed in response to a more or less consistent discipline of habituation to which the community is subjected, and that the consensus can extend only so far and maintain its force only so long as the discipline of habituation exercised by the circumstances of life enforces it and backs it up. The scheme of life, within which lies the scheme of knowledge, is a consensus of habits in the individuals which make up the community. The individual subjected to habituation is each a single individual agent, and whatever affects him in any one line of activity, therefore, necessarily affects him in some degree in all his various activities. The cultural scheme of any community is a complex of the habits of life and of thought prevalent among the members of the community. It makes up a more or less congruous and balanced whole, and carries within it a more or less consistent habitual attitude toward matters of knowledge—more or less consistent according as the community's cultural scheme is more or less congruous throughout the body of the population; and this in its turn is in the main a question of how nearly uniform or consonant are the circumstances of experience and tradition to which the several classes and members of the community are subject.
So, then, the change which has come over the scientific point of view between pre-Darwinian and post-Darwinian times is to be explained, at least in great part, by the changing circumstances of life, and therefore of habituation, among the people of Christendom during the life-history of modern science. But the growth of a scientific point of view begins farther back than modern Christendom, and a record of its growth would be a record of the growth of human culture. Modern science demands a genetic account of the phenomena with which it deals, and a genetic inquiry into the scientific point of view necessarily will have to make up its account with the earlier phases of cultural growth. A life-history of human culture is a large topic, not to be attempted here even in the sketchiest outline. The most that can be attempted is