"The cause of this callous state of feeling," he believed, "was owing to their exceeding ignorance of the horrors of slavery." He accordingly made up his mind to throw the light which he possessed into the midst of this darkness.

He had written in prison three lectures on "Slavery and Colonization." What better could he now do than to deliver those lectures at the North?
If the good people and their religious leaders knew what he knew, they would presently feel as he did on the question.

He was loath to leave Baltimore without giving this testimony against slavery.

But unable to procure a room for this purpose was finally compelled to content himself with the witness he had already borne in the _Genius_ and in prison in behalf of the slave.

In Philadelphia he well-nigh failed to obtain a hall for his lectures, but did finally succeed in getting the Franklin Institute, where, to small audiences, he lifted up his voice against the iniquity of the times.