merely relative, for absolute rest, complete equipose does not exist. The movement of the particles strives towards equipose, the movement of the mass in turn destroys the equipose, so that rest and equipose where they occur are the results of arrested motion, and it is evident that this motion is capable of being measured in respect of its results, of being expressed in itself and of being restored in some form or other external to itself. But Herr Duehring would never be satisfied with such a simple explanation of the matter. Like a good metaphysician he creates a yawning gulf between motion and equipose which does not really exist and then wonders if he can find no bridge across the self-created chasm. He might just as well bestride his metaphysical Rosinante and hunt the "Ding an Sich" of Kant since it is in the last analysis nothing else than this which stands behind the undiscoverable bridge.
But what about the mechanical theory of heat and of latent heat which is a "stumbling block" in the path of the theory?
If one convert a pound of ice at freezing point under normal atmospheric pressure into a pound of water of the same temperature by means of heat there vanishes a quantity of heat which could heat the same pound of water from 0° centigrade to 79° centigrade, or seventy-nine pounds of water one degree centigrade. If one heat this pound of water to boiling point, that is, to one hundred degrees centigrade and change it into steam of the heat of one hundred degrees centigrade there vanishes up to the time when the last of the water is changed into steam a seven fold greater quantity of heat, capable of raising the temperature of 537.2 pounds of water one degree. This dissipated heat is called latent. It is transformed, by cooling the steam, into water again, and the
