The Power That Preserves | My Web Site Page 172 Chapter 03 Page 03

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The rivalry between Savery and Papin appears to have stimulated attention to the question of fuel saving. Dr. John Allen, in 1730, called attention to the fact that owing to the short length of time of the contact between the gases and the heating surfaces of the boiler, nearly half of the heat of the fire was lost. With a view to overcoming this loss at least partially, he used an internal furnace with a smoke flue winding through the water in the form of a worm in a still. In order that the length of passage of the gases might not act as a damper on the fire, Dr. Allen recommended the use of a pair of bellows for forcing the sluggish vapor through the flue. This is probably the first suggested use of forced draft. In forming an estimate of the quantity of fuel lost up the stack, Dr. Allen probably made the first boiler test.

Prof. E. B. Poulton[31] has shown that the anthropologist James Cowles Prichard (1786-1848) must be included even in spite of himself among the precursors of Darwin. In some passages of the second edition of his _Researches into the Physical History of Mankind_ (1826), he certainly talks evolution and anticipates Prof. Weismann in denying the transmission of acquired characters. He is, however, sadly self-contradictory and his evolutionism weakens in subsequent editions--the only ones that Darwin saw. Prof. Poulton finds in Prichard's work a recognition of the operation of Natural Selection. "After inquiring how it is that 'these varieties are developed and preserved in connexion with particular climates and differences of local situation,' he gives the following very significant answer: 'One cause which tends to maintain this relation is obvious. Individuals and families, and even whole colonies perish and disappear in climates for which they are, by peculiarity of constitution, not adapted. Of this fact proofs have been already mentioned.'" Mr. Francis Darwin and Prof. A. C. Seward discuss Prichard's "anticipations" in _More Letters of Charles Darwin_, Vol. _I._ p. 43, and come to the conclusion that the evolutionary passages are entirely neutralised by others of an opposite trend. There is the same difficulty with Buffon.

He continued, however, during his reign, to manifest the peaceful, quiet, and serious character which had led him to enter the monastery, and which had probably been strengthened and confirmed by the influences and habits to which he had been accustomed there. He had, however, a very able, energetic, and warlike minister, who managed his affairs with great ability and success for a long course of years. Ethelwolf, in the mean time, leaving public affairs to his minister, continued to devote himself to the pursuits to which his predilections inclined him. He visited monasteries; he cultivated learning; he endowed the Church; he made journeys to Rome. All this time, his kingdom, which had before almost swallowed up the other kingdoms of the Heptarchy, became more and more firmly established, until, at length, the Danes came in, as is described in the last chapter, and brought the whole land into the most extreme and imminent danger. The case did not, however, become absolutely desperate until after Ethelwolf's death, as will be hereafter explained.

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