"But I have an additional cause for gratitude for an acknowledgment from a quarter whence I least expected any favor to my system. Mr. Cooke, formerly associated with Wheatstone, told one of the gentlemen, who informed me of it, that he had just recommended to the British Government the substitution of my system for their present system, and had no doubt his recommendation would be entertained. He also said that he had heard I was about to visit Europe, and that he should take the earliest opportunity to pay his respects to me. Under these circumstances I called and left my card on Mr. Cooke, and I have now a note from him stating he shall call on me on Thursday. Thus the way seems to be made for the adoption of my Telegraph throughout _the whole world_. "I visited one of the offices with Dr. Whitehouse and Mr. Brett where (in the city) I found my instruments in full activity, sending and receiving messages from and to Paris and Vienna and other places on the Continent. I asked if all the lines on the Continent were now using my system, that I had understood that some of the lines in France were still worked by another system. The answer was--'No, _all the lines on the Continent_ are now _Morse lines_.' You will undoubtedly be pleased to learn these facts." While he was thus being wined, and dined, and praised by those who were interested in his scientific achievements, he harked back for a few hours to memories of his student days in London, for his old friend and room-mate, Charles R. Leslie, now a prosperous and successful painter, gave him a cordial invitation to visit him at Petworth, near London. Morse joyfully accepted, and several happy hours were spent by the two old friends as they wandered through the beautiful grounds of the Earl of Egremont, where Leslie was then making studies for the background of a picture. The next letter to his brother Sidney is dated Copenhagen, July 19:--