From New Orleans

New Yo;-!;, Mnrch ïLr. The Heral(Ts New Grlons lutter of the 17th tsays : Col Tuvin, witli the Third Marylaiul Cavahy, arrived yestoidiiy from Madisonville, They 'had soouted fi'oin Madisonvillo through nearly ill Ihe country between the Tangipiaho and Pearl lliver. ïhe Nlnth and Tenth buttullions of Louisianii 'cavalry verc. úriven fi'oni the 'Obappatela iiiver. A number uf thern wcro oaptured, a also sonie blood hounJs wilh wliie!) Ihey liad boon Imnliny CO-nscrips. Thirty negroes oaptured by tho rebels írom a plíintatinn iieiir Ffut l'ikc, were rotnken on 'the 9th. There was not an armed rebu) within sixty miles -of MadiaonviUe, cepi possibly a íew gtdagglere. A nutuber of rebel priioaers pernotad at Vioksburg and Port Iludson, wbo aro eniiLavoiiiip; to avoid tho conscription, weie broiiülit in. Large quantities of cottoii were discovored in the couniiy through which foföea truversoii, Uit could not be removed for lack of traiiKportation. 'J'ho sentiment oí the peopki was unmiatakbly CJnion. A ]iortion of the 3d Maryland consista of lonr hiiiidi'üd, ior.erly rebel soldiers from Fort Delawaro, who look the oath of allegiance and enlisted. Tliere have no desertiotre from it in the face of the enemy. The cavalry rnarched 140 miles before retnrning here by steamer from Madisonville.