Dr. Upham had already made an examination of the best organs and organ-factories in New England, New York, and elsewhere in this country, and received several specifications and plans from builders. He proceeded at once, therefore, to Europe, examined the great English instruments, made the acquaintance of Mr. Hopkins, the well-known organist and recognized authority on all matters pertaining to the instrument, and took lessons of him in order to know better the handling of the keys and the resources of the instrument. In his company, Dr. Upham examined some of the best instruments in London. He made many excursions among the old churches of Sir Christopher Wren's building, where are to be found the fine organs of "Father Smith," John Snetzler, and other famous builders of the past. He visited the workshops of Hill, Gray and Davidson, Willis, Robson, and others. He made a visit to Oxford to examine the beautiful organ in Trinity College. He found his way into the organ-lofts of St. Paul's, of Westminster Abbey, and the Temple Church, during the playing at morning and evening service. He inspected Thompson's _enharmonic_ organ, and obtained models of various portions of organ-structure. From London Dr. Upham went to Holland, where he visited the famous instruments at Haarlem, Amsterdam, and Rotterdam, and the organ-factory at Utrecht, the largest and best in Holland. Thence to Cologne, where, as well as at Utrecht, he obtained plans and schemes of instruments; to Hamburg, where are fine old organs, some of them built two or three centuries ago; to Lubeck, Dresden, Breslau, Leipsic, Halle, Merseburg. Here he found a splendid organ, built by Ladergast, whose instruments excel especially in their tone-effects. A letter from Liszt, the renowned pianist, recommended this builder particularly to Dr. Upham's choice. At Frankfort and at Stuttgart he found two magnificent instruments, built by Walcker of Ludwigsburg, to which place he repaired in order to examine his factories carefully, for the second time. Thence the musical tourist proceeded to Ulm, where is the sumptuous organ, the work of the same builder, ranking, we believe, first in point of dimensions of all in the world. Onward still, to Munich, Bamberg, Augsburg, Nuremberg, along the Lake of Constance to Weingarten, where is that great organ claiming to have sixty-six stops and six thousand six hundred and sixty-six pipes; to Freyburg, in Switzerland, where is another great organ, noted for the rare beauty of its _vox-humana_ stop, the mechanism of which had been specially studied by Mr. Walcker, who explained it to Dr. Upham. Returning to Ludwigsburg, Dr. Upham received another specification from Mr. Walcker. He then passed some time at Frankfort examining the specifications already received and the additional ones which came to him while there.