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Show Laughter a Series of Barks. Laughing is barking, Bay tho scientists, sci-entists, Tho neck and head are thrown hack while n series of short barks aro emitted from tho throat However musicnl tho barks may bo, they nro barks. Tho laugh begins with a sudden nnd vloleut contraction of tho muscles of tho Chest and abdomen. ab-domen. But instead of opening to let tho air pass out of tho lungs, tho vo.cn! cords approach each other and hold it back.. But thoy aro not strong enough to exerciso such opposition for more fhnn an Instant, and tho nlr, which Is under pressure, promptly escapos. Aa it does sq it m,akes tho vocal cords vibrato vi-brato producing .the bark. This obstruction and liberation of tho nlr expelled from tho lungs repeats Itself again and again at intervnjs of a quarter of a secpnd. Thero aro thus In n hearty, laugh, four barks a second, nnd If continued, tliey go on at that rate as long as tho air reserve in the 'lungB holds out. Tho empty lung must then nil themselves, nnd tills Interval In-terval Is. marked by a quick gasp for breath, after which, the barks nro renewed. re-newed. Tho barks occur in sories With gasps for breath' nt Intervals. When laughter Is violent, tho entlro- body participates. The upper part of the trunk bends and straightens Itself I alternately or sways to right and left Tho feet stamp on tho floor, while th& hands are pressed "upon tho loins to moderate the painful spasni.. I |