Tadini was vexed with my incredulity, and shewed me a number of testimonials, which I might possibly have read, if the first which met my eye had not been from a lady who protested to all and singular that M. Tadini had cured her of amaurosis. At this I laughed in his face and told him to leave me alone. A few days after I found myself dining with him at the house of the lady with the cataract. She had almost made up her mind to submit to the operation, but as the rascal had mentioned my name, she wanted me to be present at a dispute between Tadini and the other oculist who came in with the dessert. I disposed myself to listen to the arguments of the two rival professors with considerable pleasure. The Warsaw oculist was a German, but spoke French very well; however, he attacked Tadini in Latin. The Italian checked him by saying that their discourse must be conducted in a language intelligible to the lady, and I agreed with him. It was plain that Tadini did not know a word of Latin. The German oculist began by admitting that after the operation for cataract there was no chance of the disease returning, but that there was a considerable risk of the crystalline humour evaporating, and the patient being left in a state of total blindness. Tadini, instead of denying this statement (which was inaccurate), had the folly to take a little box out of his pocket. It contained a number of minute round crystals. "What's that?" said the old professor. "A substance which I can place in the cornea to supply the loss of the crystalline matter." The German went off into a roar of laughter so long and loud that the lady could not help laughing. I should have liked to join them, but I was ashamed to be thought the patron of this ignorant fellow, so I preserved a gloomy silence. Tadini no doubt interpreted my silence as a mark of disapproval of the German's laughter, and thought to better matters by asking me to give my opinion. "As you want to hear it," said I, "here it is." "There's a great difference between a tooth and the crystalline humour; and though you may have succeeded in putting an artificial tooth into a gum, this treatment will not do with the eye." "Sir, I am not a dentist." "No, nor an oculist either." At this the ignorant rascal got up and left the room, and it was decidedly the best thing he could do. We laughed over this new treatment, and the lady promised to have nothing more to do with him. The professor was not content to despise his opponent in silence. He had him cited before the Faculty of Medicine to be examined on his knowledge of the eye, and procured the insertion of a satiric article in the news on the new operation for replacing the crystalline humour, alluding to the wonderful artist then in Warsaw who could perform this operation as easily as a dentist could put in a false tooth. This made Tadini furious, and he set upon the old professor in the street and forced him to the refuge in a house.