I lost no time in getting a Deluel gauge, and the same night had the condenser drilled to put it on. To my disgust no tap could be found to fit its thread. So I had to drive a wooden plug in the hole. The next day I called again at their store, nearly three miles from the Champ de Mars, and told them of my predicament. With a profusion of regrets for the inconvenience I had been put to, which he must have known that I would be, the gentleman produced a set of taps, and kindly loaned them to me, observing with evident pride that this was “a thread peculiar to their house.” The Deluel gauge was put on that night, and next morning I had the great satisfaction of seeing that its reading agreed with that of the Bourdon gauge precisely. I neglected to patent this condenser, so there was nothing to connect me with it, and the next year coming home, where I had no occasion for it, I quite lost sight of it. But at our Centennial Exhibition, nine years after, I saw a large horizontal engine sent from Belgium with the old familiar box behind the cylinder, and about twenty years after that I had the pleasure of having the condenser described to me, as if I were a stranger to it, by Mr. F. M. Wheeler, who mentioned particularly the inclined bottom of the condensing chamber, the feature by which the air was prevented from mingling with the water. He informed me that it was a condenser then commonly used in Europe, and was seen in all illustrations of horizontal condensing engines. I have forgotten whether or not I told him what I knew about the origin of this condenser. At this exposition only the English had a building devoted to the show of artillery. The principal features that I remember were the Whitworth and the Armstrong systems, which were elaborately represented. I used to say that the British lion here invited the other beasts to examine his teeth. The French and the English had each a large building on the bank of the Seine devoted to naval exhibits. In the former I happened to be present at a reception held by the young Prince Imperial, at which he received the congratulations of, among others, many prominent Englishmen, some of whom I recognized. How bright, then, seemed his prospects! How sad his end! But how grand for France, her return to a free republic; long may it live!