The Philadelphia Female Anti-Slavery Society was established in 1833 by William Lloyd Garrison. An interracial group of abolishinists, the PFASS consisted of well-known female figures such as Lucretia Mott, Lydia White, Esther Moore, and Sidney Ann Lewis. These women are outstanding, not only because of their contributions to the abolishinist movement, but also because of the work they did in aiding the development of American feminism. The contributions of the PFASS are many, but one that must be mentioned is the support the PFASS provided in the publication of many important anti-slavery literature such as Angelina Grimké's "An Appeal to the Christian Women of the South", published in 1836. The group's work regarding anti-slavery petitions in Washington is also notable. 

"The Anti-Slavery Alphabet", as explained in the gallery exhibit, was written and published to be sold in the Anti-Slavery Fair in Philadelphia, in order to raise money for the abolitionist movement. 

Sources: https://www-jstor-org.ezproxy.libraries.udmercy.edu/stable/20091253?searchText=Cradle+of+Feminism+The+Philadelphia+Female+Anti-Slavery+Society%2C+1833-1840&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3DCradle%2Bof%2BFeminism%253A%2BThe%2BPhiladelphia%2BFemale%2BAnti-Slavery%2BSociety%252C%2B1833-1840&ab_segments=0%2FSYC-6704_basic_search%2Ftest-2&refreqid=fastly-default%3A0f61a144111e9772880bab97be0d89bb#metadata_info_tab_contents

Image: https://upload.wikimedia.org/wikipedia/commons/f/fa/AntiSlaverySocietyMarker.JPG