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I shall let [Anne] Wallace put the case herself, at what I think is necessary length: 'As travel in general becomes physically easier, faster, and less expensive, more people want and are able to arrive at more destinations with less unpleasant awareness of their travel process. At the same time the availability of an increasing range of options in conveyance, speed, price, and so forth actually encouraged comparisons of these different modes... and so an increasingly positive awareness of process that even permitted semi-nostalgic glances back at the bad old days... Then, too, although local insularity was more and more threatened... people also quite literally became more accustomed to travel and travellers, less fearful of 'foreign' ways, so that they gradually became able to regard travel as an acceptable recreation. Finally, as speeds increased and costs decreased, it simply ceased to be true that the mass of people were confined to that circle of a day's walk: they could afford both the time and the money to travel by various means and for purely recreational purposes... And as walking became a matter of choice, it became a possible positive choice: since the common person need not necessarily be poor. Thus, as awareness of process became regarded as advantageous, 'economic necessity' became only one possible reading (although still sometimes a correct one) in a field of peripatetic meanings that included 'aesthetic choice'.' It sounds a persuasive case. It is certainly possible that something like the shift in consciousness that Wallace describes may have taken place by the 'end' (as conventionally conceived) of the Romantic period, and influenced the spread of pedestrianism in the 1820s and 1830s; even more likely that such a shift was instrumental in shaping the attitudes of Victorian writing in the railway age, and helped generate the apostolic fervour with which writers like Leslie Stephen and Robert Louis Stevenson treated the walking tour. But it fails to account for the rise of pedestrianism as I have narrated it.

Robin Jarvis
It will be noticed that the fundamental theorem proved above bears some remarkable resemblances to the second law of thermodynamics. Both are properties of populations, or aggregates, true irrespective of the nature of the units which compose them; both are statistical laws; each requires the constant increase of a measurable quantity, in the one case the entropy of a physical system and in the other the fitness, measured by m, of a biological population. As in the physical world we can conceive the theoretical systems in which dissipative forces are wholly absent, and in which the entropy consequently remains constant, so we can conceive, though we need not expect to find, biological populations in which the genetic variance is absolutely zero, and in which fitness does not increase. Professor Eddington has recently remarked that 'The law that entropy always increases-the second law of thermodynamics-holds, I think, the supreme position among the laws of nature'. It is not a little instructive that so similar a law should hold the supreme position among the biological sciences. While it is possible that both may ultimately be absorbed by some more general principle, for the present we should note that the laws as they stand present profound differences-(1) The systems considered in thermodynamics are permanent; species on the contrary are liable to extinction, although biological improvement must be expected to occur up to the end of their existence. (2) Fitness, although measured by a uniform method, is qualitatively different for every different organism, whereas entropy, like temperature, is taken to have the same meaning for all physical systems. (3) Fitness may be increased or decreased by changes in the environment, without reacting quantitatively upon that environment. (4) Entropy changes are exceptional in the physical world in being irreversible, while irreversible evolutionary changes form no exception among biological phenomena. Finally, (5) entropy changes lead to a progressive disorganization of the physical world, at least from the human standpoint of the utilization of energy, while evolutionary changes are generally recognized as producing progressively higher organization in the organic world.

Ronald A. Fisher
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