I began to feel a little uneasy.

I had never yet taken the slightest advantage of my poor Lucilla's blindness.

And here was her promised husband--of all the people in the world--proposing to me to keep her in the dark.
"Is the new doctor's treatment dangerous ?" I inquired.
"Not in the least." "Is it not so certain as he has led Lucilla to believe ?" "It is quite certain.
"Did the other doctors know of it ?" "Yes." "Why did they not try it ?" "They were afraid." "Afraid?
What _is_ the treatment ?" "Medicine." "Many medicines?
or one ?" "Only one." "What is the name of it ?" "Nitrate of Silver." I started to my feet, looked at him, and dropped back into my chair.
My mind reverted, the instant I recovered myself, to the effect produced on me when the blue man in Paris first entered my presence.

In informing me of the effect of the medicine, he had (you will remember) concealed from me the malady for which he had taken it.

It had been left to Oscar, of all the people in the world, to enlighten me--and that by a reference to his own case! I was so shocked that I sat speechless.
With his quick sensibilities, there was no need for me to express myself in words.