protection of the law is claimed, with by-laws, joint capital, etc. This may be ordinary speculation, but as a rule it is disease. The predilection for forming societies met with among all the degenerate and hysterical may assume different forms. Criminals unite in bands, as Lombroso expressly establishes.[45] Among pronounced lunatics it is the _folie à deux_, in which a deranged person completely forces his insane ideas on a companion; among the hysterical it assumes the form of close friendships, causing Charcot to repeat at every opportunity: ‘Persons of highly-strung nerves attract each other;’[46] and finally authors found schools. The common organic basis of these different forms of one and the same phenomenon--of the _folie à deux_, the association of neuropaths, the founding of æsthetic schools, the banding of criminals--is, with the active part, viz., those who lead and inspire, the predominance of obsessions: with the associates, the disciples, the submissive part, weakness of will and morbid susceptibility to suggestion.[47] The possessor of an obsession is an incomparable apostle. There is no rational conviction arrived at by sound labour of intellect, which so completely takes possession of the mind, subjugates so tyrannically its entire activity, and so irresistibly impels it to words and deeds, as delirium. Every proof of the senselessness of his ideas rebounds from the deliriously insane or half-crazy person. No contradiction, no ridicule, no contempt, affects him; the opinion of the majority is to him a matter of indifference; facts which do not please him he does not notice, or so interprets that they seem to support his delirium; obstacles do not discourage him, because even his instinct of self-preservation is unable to cope with the power of his delirium, and for the same reason he is often enough ready, without further ado, to suffer martyrdom. Weak-minded or mentally-unbalanced persons, coming into contact with a man possessed by delirium, are at once conquered by the strength of his diseased ideas, and are converted to them. By separating them from the source of inspiration, it is often possible to cure them of their transmitted delirium, but frequently their acquired derangement outlasts this separation. This is the natural history of the æsthetic schools. Under the influence of an obsession, a degenerate mind promulgates some doctrine or other--realism, pornography, mysticism, symbolism, diabolism. He does this with vehement penetrating eloquence, with eagerness and fiery heedlessness. Other degenerate, hysterical, neurasthenical minds flock around him, receive from his lips the new doctrine, and live thenceforth only to propagate it.