3. According to Lange, and in spite of popular opinion, there is no increase in the biliary secretion; but this is not the case with the saliva, as is proved by the phrase, “foaming with wrath.” It is important to note that anger sometimes gives the secretions a toxic character. Van Swieten, Bichat, Trousseau, and others have verified this in the case of the saliva, when the quantity of ptomaine is augmented; and it has long been known that the bite of furious animals is dangerous, while analogous facts have been ascertained in the case of one human being bitten by another in a fit of rage. The lacteal secretion may also become toxic, and produce on the nursling the effect of poison. These facts once more show the close relations between emotion and physiological or even chemical phenomena. In short, the organism in general, and the active organs in particular, being excited, we may say with Spencer, “that what we call the natural language of anger is due to a partial constriction of the muscles which actual combat would call into full activity, all signs of irritation, beginning with the rapid shadow which passes over the brow when some slight cause of irritation occurs, being different degrees of the same contractions.” Anger and fear form an antithesis, but the former has, both physiologically and psychologically, a more complex character. In fact, fear, in all its degrees and throughout its whole duration, invariably remains within the category of painful emotions, while anger passes through two stages. The first, or asthenic, corresponds to the cause, the external occurrence, the immediate shock, and consists in a short depression, which is an entirely painful state; the second, or sthenic, corresponds to the offensive reaction, and, by its symptoms, approaches much more closely to pleasure than to pain. We need only remember the sardonic laughter which accompanies not merely the outbreak of anger, but some of its mitigated forms, and expresses the joy of seeing others suffer. Anger is therefore a mixed emotion; it does not belong altogether to the category of painful states of consciousness, though the painful side is predominant. Considered as an internal and purely psychical phenomenon, it eludes description, like every state which defies further analysis, and, in its acute forms, cannot be seized by internal observation. It scarcely admits of retrospective examination. Its psychology is the history of its evolution, comprising three principal periods:—