Banneker's 1792 almanac contained an extract from an anonymous essay entitled ""On Negro Slavery, and the Slave Trade"" that the "Columbian Magazine" had published in 1790. After quoting a statement that David Rittenhouse had made (that Negroes "have been doomed to endless slavery by us — merely because "their" bodies have been disposed to reflect or absorb the rays of light in a way different from "ours""), the extract concluded:The time, it is hoped "is not very remote", when those ill-fated people, dwelling in this land of freedom, shall commence a participation with the white inhabitants, in the blessings of liberty; and experience the kindly protection of government, for the essential rights of human nature.