Rubuta ci gaba don wannan sakin layi - A cikin karni na bin Tracy, kalmar "ideology" ta koma baya da gaba tsakanin ma'ana mai kyau da mara kyau. A lokacin wannan ƙarni na gaba, lokacin da gwamnatocin bayan-Napoleonic suka ɗauki matsayin mai adawa, ya rinjayi masu tunanin Italiyanci, Mutanen Espanya da Rasha waɗanda suka fara bayyana kansu a matsayin "masu sassaucin ra'ayi" kuma waɗanda suka yi ƙoƙari su sake haifar da ayyukan juyin juya hali a farkon 1820s, gami da 'yan tawayen Carlist a Spain; da Carbonari al'ummomi a Faransa da Italiya; da Decembrists
a Rasha. Karl Marx ya ɗauki ma'anar ma'anar Napoleon na kalmar, ta yin amfani da shi a cikin rubuce-rubucensa, inda ya taɓa bayyana Tracy a matsayin (wani'mai koyar da ilimin bourgeois na kifi').