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Empedocles says, that the fleshy parts of us are constituted by the contemperation of the four elements in us; earth and fire mixed with a double proportion of water make nerves; but when it happens that the nerves are refrigerated where they come in contact with the air, then the nails are made; the bones are produced by two parts of water and the same of air, with four parts of fire and the same of earth, mixed together; sweat and tears flow from liquefaction of bodies.
The discovery of benzine and the liquefaction of numerous gases were followed by an investigation of electric currents, and in 1831 by the crowning discovery of induction. Not less valuable perhaps than these discoveries of his own were the fertile suggestions which he left to others.
Latent heat, in the present acceptation of the term, means sensible liquefaction or vaporization; but to produce these changes heat is as necessary as to produce the expansion of mercury in a thermometer tube, which is taken as the measure of temperature; and it is hard to see on what ground heat can be said to be latent when its presence is made manifest by changes which only heat can effect.
The garçon who says, "I speke Aingliss," brings us each a delicious orange granizada, a sort of half-frozen water-ice, familiar to Italy, but unknown in America. It is ice in the first enthusiasm of freezing, condensed, not hardened. Promoting its liquefaction with the spoon, you enjoy it through the mediation of a straw.
May we not say that there is a size of the spheroid such that the pressure will not be great enough to produce liquefaction at any other place than the centre? or, in other words, that in the process of decreasing temperature and increasing pressure, the centre will be the place at which the combined conditions of pressure and temperature will be first reached?
Degenerative changes may produce areas of softening or liquefaction which result in the formation of cystic cavities in the interior of the tumour. The colour depends on the amount of blood in the tumour, and on the presence of the products of degeneration. The blood vessels are usually represented by mere chinks or spaces between the cells.
Andrews' experiments imply that, supposing the temperature to be lowered to the point at which liquefaction becomes possible, then liquefaction will take place where there is first reached the required pressure. What are the corollaries in relation to concentrating nebulous spheroids?
The changes that ensue resemble in character those in other tissues, and the extent of the destruction varies according to the way in which the tubercle bacillus and the marrow interact upon one another. The granulation tissue may undergo caseation and liquefaction, or may become encapsulated by fibrous tissue "encysted tubercle."
I cannot tell why people who believe that angels appeared and fought on our side at the battle of Mons, and who believe that miracles occur quite frequently at Lourdes, nevertheless boggle at the miracle of the liquefaction of the blood of St. Januarius, and reject it as a trick of priestcraft.
This is the north pole of the physicist's world, the absolute zero of temperature the point at which the heat-vibrations of matter are supposed to be absolutely stilled. Theoretically this point lies 2720 below the Centigrade zero. With the liquefaction of hydrogen, a temperature of about -253 deg or -254 deg Centigrade has been reached. So the gap seems not so very great.
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