Caleb paused a moment and took a deep breath. He had reached the critical point in his temptation of Madame Oriano, and he tried to put into his tone the portentousness that his announcement seemed to justify.

“Nor have I been idle in my spare time, ma’am. No, I have devoted much of that spare time to study. I have been rewarded, ma’am. God has been very good to me and blessed the humble talent with which he entrusted me. Yes, ma’am. I have discovered a method of using chlorate of potash in combination with various other chemicals which will undoubtedly revolutionise the whole art of pyrotechny. Will you consider me presumptuous, ma’am, when I tell you that I dream of the moment when Fuller’s Fireworks shall become a byword all over Great Britain for all that is best and brightest in the world of pyrotechny?”

Madame Oriano’s eyes flashed like Chinese fire, and Caleb, perceiving that he had made a false move, tried to retrieve his position.

“Pray do not suppose that I was planning to set myself up as a manufacturer of fireworks on my own. So long as you will have me, ma’am, I shall continue to work for you, and if you consent to my marrying your Letizia I shall put my new discovery at your service on a business arrangement that will satisfy both parties.”

Madame Oriano pondered the proposal in silence for a minute.

“Yes, you can have Letizia,” she said at last.

Caleb picked up the hand that was hanging listlessly over the coverlet and in the effusion of his gratitude saluted it with an oily kiss.

“And you’ll do your best to make Letizia accept me as a husband?” he pressed.

“If I say you can have Letizia, caro, you willa have her,” the mother declared.

“You have made me the happiest man in England,” Caleb oozed.