Jtlore Ic velopementH 1» llie ItidnftpplngCase*Tho evidence n gurnet George Shaw, now confined in tho county jail, awaiting tho trial for conspiracy and kidnapping, is growing stronger daily. It seem* tbat-bo has been boasting of his success in abducting Ferris. We givo below an extract from a letter received by a gentleman of this city from a brother in Tuscmnbia, Alabama, in relation to Shaw :“ I suppose yeu remember George W. Farris, y ur old Acquaintance, the bricklayer: well, he is n-.w “flaked” down on his “mnssaV* Plantation. He is a negro, and was born and raised hero. Six years ago ho loft hero, ran away, and wont North. IPs master, whoso name is R^hin, nev-.r took tho pains to capture him, and he run n until !.?st sum hut, whena bricklayer in Pittsburgh by the name of Shaw,who belonged to*hi* ph.ee, and i« in Pittsburgh now, I suppt so, saw h m 'here and “ spotted” him for detection. \Vh«'n he (Farris) started for St. Louis last summer. Shaw was in bis glory, f*-r that wn^ all he wanted. He sat down and wrote in Raglan He then came out hero, and Raglan not being at home, ho and a slave hunter named Bill Julian, started away from here o1?tho 3 \ day of January, fur .Teffer son City, Missouri, and brought him back hand cuff cd to this plane, on tho 23b just • being gone twenty days. I saw him (Fnrrh) around the streets pretty often ; they have not done anything with him as yet.I spoke to him two or three times, but nevor let on*who I was.“Shaw has gono topittsburgh to get hi? wife, and bring her away from what ho calls an abolition bole, for I saw him stand up at a corner in this town and tell the people that there was not a person in Pittsburgh tb»t was not an abolitionist,fmt himself (Rha^) and his wife. I have nothing more to say about him, and hnro given all tho particulars as far as T have learned them about tho transaction.”