68     In the living human being no permanent neutralization of contrary or antagonistic sensations can take place, as happens with substances of opposite qualities in the chemical laboratory, where, for instance, sulphuric acid and potash unite to form a perfectly different substance, a neutral salt, which is now no longer either acid or alkali, and is not decomposed even by heat. Such amalgamations and thorough combinations to form something permanently neutral and indifferent do not, as has been said, ever take place with respect to dynamic impressions of an antagonistic nature in our sensific apparatus. Only a semblance of neutralization and mutual removal occurs in such cases at first, but the antagonistic sensations do not permanently remove one another. The tears of the mourner will be dried for but a short time by a laughable play; the jokes are, however, soon forgotten, and his tears then flow still more abundantly than before.