Tadini talked to everybody about the operations he had performed, and condemned an oculist who had been at Warsaw for twenty years, saying that he did not understand how to extract a cataract, while the other oculist said that Tadini was a charlatan who did not know how the eye was made.

Tadini begged me to speak in his favour to a lady who had had a cataract removed by the Warsaw oculist, only to return again a short time after the operation.

The lady was blind of the one eye, but she could see with the other, and I told Tadini that I did not care to meddle with such a delicate matter.

“I have spoken to the lady,” said Tadini, “and I have mentioned your name as a person who will answer for me.”

“You have done wrong; in such a matter I would not stand surety for the most learned of men, and I know nothing about your learning.”

“But you know I am an oculist.”

“I know you were introduced to me as such, but that’s all.  As a professional man, you should not need anyone’s commendation, you should be able to say, ‘Operibus credite’.  That should be your motto.”

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.