adopted to rap upon the floor, the whole must be concealed within the sanctuary of _skirts_ beyond the invasion of the curious or rude. We have other more perfect, better concealed rapping instruments than the one just described,[7] but not quite so simple or easy of application. Moreover the one described gives the double rap, (a peculiarity of the Fox contrivance.) These girls managed their instrument adroitly, and deserve some little credit for their ingenuity in contriving and operating an instrument so successfully as to baffle the scrutiny of thousands of their visitors. They walk freely about with their instruments, though a lady remarked to us that they both walked very awkwardly. With local preparations "_mysterious_" rappings may be produced in a variety of ways, but these girls, the _prototypes_ of all rappers, neither employed or needed any aid from electro-magnetic motions, acoustic science, or confederacy to practise their arts, they used more ingenious and simple means. It is possible to make a rapping electro-magnetic movement, battery and all, small enough to be carried under the dress, but like the telegraph, it must be controlled by volition and muscular action of the operator, and where is the advantage of this over a mechanical instrument that raps directly? There is no necessity for wonderment or the taxation of ingenuity on account of these rapping sounds so long as you are excluded from a personal examination of the rappers. We wish very much that the civil authorities would pounce upon these rappers in the "_very act_" (_for obtaining money upon false pretences_)--(or some other plea) and make a forcible disclosure of their trappings. We believe that this can and should be done, and that such a proceeding would meet the full sanction of law and justice; that universal public opinion would sustain it, and we have no doubt of the nature and effect of the _denouement_. If it had already been done, we should have been spared the labor of this treatise at least, and we need not advert to the vast amount of suffering and vice that would have been forestalled.