NEW YORK, March 24.---Upton Sinclair, the socialist author, and his pretty second wife have quit the Unit ed States for good and all, accord ing to letters that have been received by their friends here. The Sin clairs have severed all relations with the famous Arden colony, because of 4 disagreement vines trustees that grew out of Sinclair’ desire to play baseball on the ath. The Sin clairs are now in Bermuda, where they intend to establish their per manent home. UPTON SINCLAIR,