I had not previously been aware that the painting The Young Catechist by Henry Hoppner Mayer, now owned by Bristol Art Gallery
was actually an illustration to verses by Charles Lamb. Holding her Book of Common Prayer the white girl is instructing the African in the responses to the Anglican catechism, which will lead to his baptism.
In fact, now I look more closely, Lamb's lines were in fact a literary illustration to the painting.
both are lamentable productions, even if their aims were laudable,
However, both are useful examples of the racist aspect to Abolitionist sentiments and campaigns in the 19th century.
Here's The Young Catechist poem