Less than six weeks passed, when, on August 14th, the second tour began, in which case the special impulse that moved him was a desire to follow up the revival work of Mr. Moody and Mr. Sankey. Their short stay in each place made them unable to lead on new converts to higher attainments in knowledge and grace, and there seemed to be a call for some instruction fitted to confirm these new believers in the life of obedience. Mr. Muller accordingly followed these evangelists in England, Ireland, and Scotland, staying in each place from one week to six, and seeking to educate and edify those who had been led to Christ. Among the places visited on this errand in 1875, were London; then Kilmarnock, Saltwater, Dundee, Perth, Glasgow, Kirkentilloch in Scotland, and Dublin in Ireland; then, returning to England, he went to Leamington, Warwick, Kenilworth, Coventry, Rugby, etc. In some cases, notably at Mildmay Park, Dundee and Glasgow, Liverpool and Dublin, the audiences numbered from two thousand to six thousand, but everywhere rich blessing came from above. This second tour extended into the new year, 1876, and took in Liverpool, York, Kendal, Carlisle, Annan, Edinburgh, Arbroath, Montrose, Aberdeen, and other places; and when it closed in July, having lasted nearly eleven months, Mr. Muller had preached at least three hundred and six times, an average of about one sermon a day, exclusive of days spent in travel. So acceptable and profitable were these labours that there were over one hundred invitations urged upon him which he was unable to accept. The third tour was on the Continent. It occupied most of the year closing May 26, 1877, and embraced Paris, various places in Switzerland, Prussia and Holland, Alsace, Wurtemberg, Baden, Hesse Darmstadt, etc. Altogether over three hundred addresses were given in about seventy cities and villages to all of which he had been invited by letter. When this tour closed more than sixty written invitations remained unaccepted, and Mr. Muller found that, through his work and his writings, he was as well known in the continental countries visited, as in England. Turning now toward America, the fourth tour extended from August, 1877, to June of the next year. For many years invitations had been coming with growing frequency, from the United States and Canada; and of late their urgency led him to recognize in them the call of God, especially as he thought of the many thousands of Germans across the Atlantic, who as they heard him speak in their own native tongue would keep the more silence. (Acts xxii. 2.)