There were many notable conversions under his preaching. At Petitcodiac a lady whose sons had been converted looked upon him as a deceiver and opposed his work. "She wrung her hands in great distress, and cried 'O that Black! that Black! he has ruined my sons! He has ruined my sons!'" But she too found peace to her soul, after some days of deep conviction. At Horton a lady who had opposed the work of grace, was laid upon a bed of affliction, and she became so greatly agitated that for three weeks she could hardly sleep, but when William Black was praying with her, she burst forth into transports of joy in finding Christ precious to her soul, shouting, "the Lord has delivered me! O I am happy! I am happy!" All through the pages of his journal there abound remarkable accounts of striking conversions, and of people being stricken down by the power of God. Churches were organized at the places he visited, nearly eighty persons being enrolled during one visit to Hillsborough and Petitcodiac. There wore notable revivals at Windsor, Cornwallis, Granville, Horton, Liverpool and other places. The most difficult part of his extensive field was at Halifax, where wickedness abounded, and the opposition was so great that at one time, when he was on his way to the city, his friends tried to persuade him to delay his visit, as they feared the press gang, but he went boldly forward, and preached with power. During his labours he was not forgetful of the needs of the coloured people, who flocked to hear him preach, and many of them were soundly converted. In 1784, he preached to about two hundred of them at Birchtown, and during the year upwards of sixty of them found peace with God. Of two hundred members at Shelburne and Birchtown, there were only twenty white people, and at Birchtown alone, there were fourteen classes in a prosperous condition. At Digby in the following year, there were sixty-six coloured people members of our church. A study of the topics and texts of his sermons shows that he preached the old doctrines, from familiar texts, easy to be grasped by the people, and he laid special emphasis always upon sin, the need of regeneration, and repentance and faith, and as he pressed home these great truths upon the souls of his hearers, there was seldom a service at which conversions did not take place. Like many other faithful ministers, he was often compelled to mourn on account of the backsliding of the people. These were seasons of depression, when he became subject to severe temptation, and mourned the leanness of his own soul. The beginning of every year however, was a time of refreshing, as he regularly and solemnly made the renewal of his covenant with God. Despite the fact that the whole province of Nova Scotia and part of New Brunswick lay before him as a wide field of enterprise, he yearned after larger conquests, and therefore in 1784, at the earnest and repeated request of Benjamin Chappel, he paid a visit to Prince Edward Island.