In December 1875, Charles Taze Russell, then a businessman from Allegheny, received a copy of "Herald of the Morning". He met the principals in the Barbourite movement and arranged for Barbour to speak in Philadelphia in 1876. Barbour and Russell began their association, during which Barbour wrote the book "Three Worlds" (1877) and published a small booklet by Russell entitled "Object and Manner of Our Lord's Return". Beginning in 1878, they each wrote conflicting views on Ransom and Atonement doctrine. By May 3, 1879, Russell wrote that their "points of variance seem to me to be so fundamental and important that… I feel that our relationship should cease." In a May 22, 1879 letter to Barbour, Russell explicitly resigned: "Now I leave the 'Herald' with you. I withdraw entirely from it, asking nothing from you… Please announce in next No. of the 'Herald' the dissolution and withdraw my name assistant editor on the masthead." In July 1879, Russell began publishing "Zion's Watch Tower", the principal journal of the Bible Student movement. Several years after Russell's death, the magazine became associated with Jehovah's Witnesses and was renamed "The Watchtower".