SB«Bifia M( Casrsrrrr. —Tbomss Jlergaa, g, vonrisajter about twenty years of axtkod hailing from Rhode lslsnd, arrived here oa Monday morning last, and that afternoon wag arrested and cased for being Can ad la eonver. aation with a negro about the late Harpers oTr 3r ™ d »^ tb *'**cntlon ofJohn Brown. When called before the Mayor yesterday, Tons pretended to be Innocent of nil bad In ten • ions, and was sorry for what he bad done —