The colonization scheme considered : in its rejection by the colored people--in its tendency to uphold caste--in its unfitness for christianizing and civilizing the aborigines of Africa, and for putting a stop to the African slave trade: in a letter to the Hon. Theodore Frelinghuysen and the Hon. Benjamin F. Butler. by Samuel E. Cornish and Theodore S. Wright, pastors of the colored Presbyterian churches in the cities of Newark and New York