DEAR SIR:--You say in letter before me, "It must, therefore, be distinctly understood that if we embark in a missionary enterprise in Kansas, this question of slavery and anti-slavery must be ignored." I respond: This reformation is pledged before heaven and earth, and under covenants the most solemn and binding into which men can enter, to guarantee freedom of thought and speech to our brotherhood-i--not indeed on subjects purely abstract, speculative and inoperative, but on Bible questions--questions which involve the well-being of humanity. This matter of slavery is a Bible question--a question of justice between man and man--of mercy and humanity. It is what Jesus would call one of the weightier matters of the law, and demands, therefore, a large place in our investigations. * * * The brethren here in Kansas have made no such stipulations with me They have left me to my own discretion in preaching the gospel to sinners, and teaching the saints according to the Bible. They have shown themselves too magnanimous to impose on my conscience a restriction which their own manhood would forbid, under similar circumstances, that they should suffer to be imposed on themselves. For myself, I will be no party, now or hereafter, to such an arrangement as that contemplated in your letter now before me. I would not make this "Reformation of the nineteenth century" a withered and blasted trunk, scattered by the lightnings of heaven, because it took part with the rich and powerful against the poor and oppressed, and because we have been recreant to those maxims of free discussion which we have so ostentatiously heralded to the world as our cherished principles. In explanation of the first letter received by Bro. Butler from the corresponding secretary, a second one was sent, from which it is necessary to make the following extracts: