"Of course, then, you must take care that the colors you use do not prove too powerful and overshadow your central figures," said Miss Cartright.

"Ah, you paint?"

"Yes, but not as I want to," was the wistful answer. "I do portraits. So I can readily see that your problem is a unique, and far more difficult one than mine. I have only a changeless color scheme to consider, while your colors shift with every cloud that passes across the sky."

Mr. Norcross nodded with pleasure at her instant appreciation of his difficulties.

"Have you ever seen stained glass in the making?" he asked.

She shook her head.

"Neither have any of the rest of us, Norcross," put in Mr. Cabot. "That is what we came for. I have been toting these two youthful friends of mine all over the world and together we have investigated almost every known form of glass, from the Naples Vase down to an American lamp chimney."

Mr. Norcross smiled.

"So you see," Uncle Bob went on, "I wanted them to witness this phase of glass-making."

"They certainly shall. How did you chance to be so interested in the making of glass?" inquired the artist, turning to Giusippe.