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<p align="left" style="font: 9px;">sea-level to the limit of the Earth’s atmosphere. He is made to observe that when he puts one end of a tube into water and the other end into his
mouth, and then draws back his tongue, so leaving a vacant space, two things happen. One is that the pressure of air outside his cheeks, no
longer balanced by an equal pressure of air inside, thrusts his cheeks inwards; and the other is that the pressure of air on the surface of the
water, no longer balanced by an equal pressure of air within the tube and his mouth (into which part of the air from the tube has gone) the water is
forced up the tube in consequence of<b>the unequal pressure. Once understanding thus the nature of the</b>so-called suction, he sees how it
happens that when the plunger of the pump is raised and relieves from atmospheric pressure the water below it, the atmospheric pressure on the
water in the well, not<i>being balanced by that on the water in the tube, forces the water higher up the</i>tube, so that it follows the plunger. And
now he sees why the water cannot be raised beyond the theoretic limit of 32 hit: a limit made much lower in practice by imperfections in the
apparatus. For if, simplifying the conception, he supposes the tube of the pump to be a square inch in section, then the atmospheric pressure of 15
pounds per square inch on the water in the well, can raise the water in the tube to such height only that the entire column of it weighs 15 pounds.
Having been thus enlightened about the pump’s action, the action of a barometer becomes intelligible. He perceives how, under the conditions
established, the weight of the column of mercury balances that of an atmospheric column of equal diameter; and how, as the weight of the
atmospheric column varies, there is a corresponding variation in the weight of the mercurial column,—shown by change of height. Moreover, having
previously supposed that he understood the ascent of a balloon when he ascribed it to relative lightness, he now sees that he did not truly
understand it. For he did not recognize it as a result of that upward pressure caused by the difference between the weight of the mhi formed by
the gas in the balloon plus the cylindrical column of air extending above it to the limit of the atmosphere, and the weight of a similar cylindrical
column of air extending down to the under surface of the<i>balloon: this difference</i>of weight causing an equivalent upward pressure on the under </p>
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<p align="left" style="font: 14px;">surface. Why do I introduce these familiar truths so entirely irrelevant to my subject? I do it to show, in the first place, the contrast between a vague
conception of a cause and a distinct conception of it; or rather, the contrast between that conception of a cause which results when it is simply
clhied with some other or others which familiarity makes us think we understand, and that conception of a cause which results when it is
represented in terms of definite physical forces admitting of measurement. And I do it to show, in the second place, that when we insist on resolving
a verbally-intelligible cause into its actual factors, we get not only a clear solution of the problem before us, but we find that the way is opened
to solutions of sundry other problems. While we rest satisfied with unanalyzed causes, we may be sure both that we do not rightly comprehend
the production of the particular effects ascribed to them, and that we overlook other effects which would be revealed to us by contemplation of
the causes as analyzed. Especially must this be so where the causation is complex. Hence we may infer that the phenomena presented by the development .</p>
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