▁those ▁of ▁the ▁Roman ▁walls ▁and ▁old ▁city . ▁The ▁advent ▁of ▁new ▁industry ▁was ▁drawing ▁Catal ans ▁by ▁the ▁thousands ▁to ▁abandon ▁their ▁far ms ▁and ▁move ▁to ▁the ▁city , ▁sp urr ing ▁a ▁shift ▁from ▁an ▁agricult ur ally ▁based , ▁rural ▁economy ▁to ▁an ▁urban ▁economy ▁focused ▁on ▁manufact uring ▁and ▁trade . ▁ ▁Between ▁ 1 8 0 1 ▁and ▁ 1 8 5 0 ▁alone , ▁the ▁population ▁of ▁Barcelona ▁grew ▁by ▁over ▁fifty ▁percent , ▁from ▁ 1 1 5 , 0 0 0 ▁to ▁roughly ▁ 1 8 7 , 0 0 0 ▁citizens . ▁However , ▁industrial ▁expansion ▁brought ▁problems ▁with ▁it . ▁Pack ed ▁living ▁qu arters , ▁dens ely ▁l ined ▁streets , ▁and ▁poor ▁public ▁infrastr ucture ▁all ▁contributed ▁to ▁the ▁spread ing ▁of ▁disease ▁and ▁un clean lin ess ▁that ▁pl ag ued ▁the ▁city ' s ▁poor er ▁masses . ▁Life ▁expect ancy ▁pl um met ed ▁to ▁ 2 3 ▁years ▁old ▁for ▁the ▁poor ▁and ▁ 3 6 ▁years ▁for ▁the ▁rich . ▁The ▁se w age ▁system ▁was ▁over wh el med ▁with ▁the ▁mass ▁of ▁people ▁sharing ▁cr amp ed ▁streets , ▁and ▁the ▁poor ly ▁designed ▁streets ▁offered ▁little ▁in ▁terms ▁of ▁fresh ▁air ▁or ▁vent ilation . ▁The ▁Jun ta ▁de ▁Der ri bo ▁in ▁the ▁ 1 8 4 0 s ▁was ▁a ▁famous , ▁published ▁account ▁of ▁the ▁conditions . ▁ ▁In ▁ 1 8 5 4 , ▁the ▁government ▁of