s ▁of ▁the ▁United ▁States . ▁The ▁re vised ▁edition ▁was ▁published ▁between ▁ 1 8 2 5 ▁and ▁ 1 8 3 3 . ▁His ▁other ▁publications ▁included ▁" Ob serv ations ▁on ▁the ▁N omen cl ature ▁of ▁Wilson ' s ▁Or n ith ology " ▁( in ▁the ▁Journal ▁of ▁the ▁Philadelphia ▁Academy ) ▁and ▁" Syn opsis ▁of ▁the ▁Bird s ▁of ▁the ▁United ▁States " ▁( in ▁the ▁Ann als ▁of ▁the ▁Ly ce um ▁of ▁New ▁York ). ▁In ▁ 1 8 2 4 , ▁Bon ap arte ▁tried ▁to ▁get ▁the ▁then ▁unknown ▁John ▁James ▁Aud ub on ▁accepted ▁by ▁the ▁Academy ▁of ▁Natural ▁Sciences , ▁but ▁this ▁was ▁opposed ▁by ▁the ▁orn ith ologist ▁George ▁Ord ▁who ▁dis lik ed ▁Aud ub on ' s ▁dram atic ▁bird ▁pos es ▁and ▁considered ▁him ▁to ▁be ▁a ▁" a ▁back - country ▁up start ▁who ▁rom antic ized ▁his ▁subject ▁matter ," ▁according ▁to ▁the ▁Aud ub on ▁Gall eries . ▁ ▁At ▁the ▁end ▁of ▁ 1 8 2 6 , ▁Bon ap arte ▁and ▁his ▁family ▁returned ▁to ▁Europe . ▁He ▁visited ▁Germany , ▁where ▁he ▁met ▁Philipp ▁Jakob ▁C ret z sch mar , ▁and ▁England , ▁where ▁he ▁met ▁John ▁Edward ▁Gray ▁at ▁the ▁British ▁Museum , ▁and ▁renew ed ▁his ▁acquaint ance ▁with ▁Aud ub on . ▁In ▁ 1 8 2 8 , ▁the ▁family ▁settled ▁in ▁Rome . ▁In ▁Italy , ▁he ▁was ▁the ▁origin ator ▁of ▁several ▁scientific