LOCAL AFFAIRS. A Pollee Officer Severely Stabbed---lm portant Arrests. it will be remembered that on lust Monday evening a men named Jacob Welker was attacked by two men at the end of the Railroad Bridge in Allegheny and badly beaten, hav ing been struck with a hatchet or adze on the bead, indict ing severe wounds. The perpetrators t f the outrage were unknown. On Thursday afternoon, Mayor Weaver visited Vooliter nt his house in Birmingham, and took his affidavit, preteirir g a charge of assault and battery' with Intent bill a_ainht two unknown p nowt, of whom lie could give but it meagr r e description. The description was Oil,: to alters:a stiti and Moon, who searched for the pt rpetratorP. and on yesterday hfternoon, on the corner of Seventh and Smithfield they saw and arrested a )oaug roan named Wil liam Moorhead, win in they believed to be the principal in this affair. On the way to the 3.layor's other, Moorhead stopped at the corner ~ 1 Virgin alley and Smith field street to get a Omit, tan ndic