Despite their generally quiet, taciturn demeanour, all these Sundanese peoples are just as liable as the Orang-Malayu himself, to those sudden outbursts of demoniacal frenzy and homicidal mania called by them _m[)e]ng-amok_, and by us "running amok." Indeed A. R. Wallace tells us that such wild outbreaks occur more frequently (about one or two every month) amongst the civilised Mangkassaras and Bugis of south Celebes than elsewhere in the Archipelago. "It is the national and therefore the honourable mode of committing suicide among the natives of Celebes, and is the fashionable way of escaping from their difficulties. A Roman fell upon his sword, a Japanese rips up his stomach, and an Englishman blows out his brains with a pistol. The Bugis mode has many advantages to one suicidically inclined. A man thinks himself wronged by society--he is in debt and cannot pay--he is taken for a slave or has gambled away his wife or child into slavery--he sees no way of recovering what he has lost, and becomes desperate. He will not put up with such cruel wrongs, but will be revenged on mankind and die like a hero. He grasps his kris-handle, and the next moment draws out the weapon and stabs a man to the heart. He runs on, with bloody kris in his hand, stabbing at everyone he meets. 'Amok! Amok!' then resounds through the streets. Spears, krisses, knives and guns are brought out against him. He rushes madly forward, kills all he can--men, women, and children--and dies overwhelmed by numbers amid all the excitement of a battle[504]." Possibly connected with this blind impulse may be the strange nervous affection called _latah_, which is also prevalent amongst the Malayans, and which was first clearly described by the distinguished Malay scholar, Sir Frank Athelstane Swettenham[505]. No attempt has yet been made thoroughly to diagnose this uncanny disorder[506], which would seem so much more characteristic of the high-strung or shattered nervous system of ultra-refined European society, than of that artless unsophisticated child of nature, the Orang-Malayu. Its effects on the mental state are such as to disturb all normal cerebration, and Swettenham mentions two latah-struck Malays, who would make admirable "subjects" at a seance of theosophic psychists. Any simple device served to attract their attention, when by merely looking them hard in the face they fell helplessly in the hands of the operator, instantly lost all self-control, and went passively through any performance either verbally imposed or even merely suggested by a sign.