A Century of Science, and Other Essays. Fiske John

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       John Fiske

      A Century of Science, and Other Essays

      Published by Good Press, 2019

       [email protected]

      EAN 4057664608338

Table of Contents

       A CENTURY OF SCIENCE

       I

       II

       III

       EDWARD LIVINGSTON YOUMANS [13]

       IV

       THE PART PLAYED BY INFANCY IN THE EVOLUTION OF MAN [16]

       V

       THE ORIGINS OF LIBERAL THOUGHT IN AMERICA [17]

       VI

       SIR HARRY VANE [22]

       VII

       THE ARBITRATION TREATY

       VIII

       FRANCIS PARKMAN [25]

       IX

       EDWARD AUGUSTUS FREEMAN

       X

       CAMBRIDGE AS VILLAGE AND CITY [27]

       XI

       A HARVEST OF IRISH FOLK-LORE

       XII

       GUESSING AT HALF AND MULTIPLYING BY TWO

       XIII

       FORTY YEARS OF BACON-SHAKESPEARE FOLLY [36]

       XIV

       SOME CRANKS AND THEIR CROTCHETS

       NOTE

       AN ACCOUNT OF THE ADONI-SHOMO COMMUNITY

       INDEX

A CENTURY OF SCIENCE

       Table of Contents

I

       Table of Contents

      A CENTURY OF SCIENCE[3]

      In the course of the year 1774 Dr. Priestley found that by heating red precipitate, or what we now call red oxide of mercury, a gas was obtained, which he called "dephlogisticated air," or, in other words, air deprived of phlogiston, and therefore incombustible. This incombustible air was oxygen, and such was man's first introduction to the mighty element that makes one fifth of the atmosphere in volume and eight ninths of the ocean by weight, besides forming one half of the earth's solid crust, and supporting all fire and all life. I know of nothing which can reveal to us with such startling vividness the extent of the gulf which the human mind has traversed within little more than a hundred years. It is scarcely possible to put ourselves back into the frame of mind in which oxygen was unknown, and no man could tell what takes place when a log of wood is burned on the hearth. The language employed by Dr. Priestley carries us back to the time when chemistry was beginning to emerge from alchemy. It was Newton's contemporary, Stahl, who invented the doctrine of phlogiston in order to account for combustion. Stahl supposed that all combustible substances contain a common element, or fire principle, which he called phlogiston, and which escapes in the process of combustion. Indeed, the act of combustion was supposed to consist in the escape of phlogiston. Whither this mysterious fire principle betook itself, after severing its connection with visible matter, was not too clearly indicated, but of course it was to that limbo far larger than purgatory, the oubliette wherein have perished men's unsuccessful guesses at truth. Stahl's theory, however, marked a great advance upon what had gone before, inasmuch as it stated the case in such a way as to admit of direct refutation. Little use was made of the balance in those days, but when it was observed that zinc and lead and sundry other substances grow heavier in burning, it seemed hardly correct to suppose that anything had escaped from these substances. To this objection the friends of the fire principle replied that phlogiston might weigh less than nothing, or, in other words, might be endowed with a positive attribute of levity, so that to subtract it from a body would increase the weight of the body. This was a truly shifty method of reasoning, in which your phlogiston, with its plus sign to-day and its minus sign to-morrow, exhibited a skill in facing both ways like that of an American candidate for public office.

      Into the structure of false science that had been reared upon these misconceptions Dr. Priestley's discovery of oxygen came like a bombshell. As in so many other like cases, the discovery was destined to come at about that time; it was made again three years afterward by the Swedish chemist Scheele, without knowing what Priestley had done. The study of oxygen soon pointed to the conclusion that, whatever may escape during combustion, oxygen is always united with the burning substance. Then came Lavoisier with his balance, and proved that whenever a thing burns it combines with Priestley's oxygen, and the weight of the resulting product is equal to the weight of the substance burned plus the weight of oxygen abstracted from the air. Thus combustion is simply union with oxygen, and nothing escapes. No room was left for phlogiston. Men's thoughts were dephlogisticated from that time forth. The balance