Intellectual occupations are facilitated by a happy love, while they are usually hindered by the sorrows of love. Even men of science, so proud of their calmness, are often more influenced than one would think in their scientific opinions by their emotional sentiments. Without a man being aware of it, his sentiments insinuate themselves into the opinions which he believes to be of a purely intellectual nature, and direct them unconsciously with much more power than he generally imagines. Such influences act chiefly on individuals disposed to sentimentality. In love, these individuals resemble two-edged swords; the intensity of their emotional reactions and sentiments drives them from one extreme to another, from foolish happiness to despair or fury. The situation becomes still more grave when such storms burst among impulsive persons of weak will and limited intelligence. Under such circumstances ill-assorted alliances are formed which lead to violent quarrels, and sometimes even to crime. When jealousy comes on the scene the man often kills the woman and commits suicide. It would seem that such crime can only arise from egoism; this is often the case, but not always. Despair may often lead to such acts, without any motive of vengeance, or even of jealousy. The storm of passion drives weak-minded persons to impulsive actions, the motives of which are very difficult to analyze. After these tragedies of murder preceding suicide, when the murderer survives, he often expresses himself as follows: "I was in such a state of despair and excitement that I saw no other issue than death for both of us." =Prudery. Modesty.=--The sentiment of modesty originates in the fear of everything which is novel and unusual, and is complicated by natural timidity. This sentiment is especially strong in children. The sentiment of sexual modesty in man thus rests on timidity and on the fear of not doing as others do. It betrays itself toward women by awkwardness and bashfulness behind which eroticism is often ill concealed. The timid and bashful man carefully endeavors to hide his sexual feelings from others. The object of modesty is in itself immaterial to the psychology of this sentiment, and shame is sometimes inspired not only by very different things but even by opposite things. One youth is ashamed of appearing erotic, another of appearing too little erotic, according to the opinion of his neighbors. Modesty depends on the custom of covering or exposing certain parts of the body, and people who live in a state of nature are as much ashamed of clothes as we are ashamed of nudity. Moreover, man soon becomes accustomed to fashion, and the same English girl who blushes at the sight of a few inches of bare skin in her own country, finds it quite natural to see naked negroes in the tropics.