Her eyes were a deep blue...."

"Or, rather, green."

"Blue."

"Green. There is a shade of green that looks blue."

"What the devil do you know about the colour of her eyes?" demanded
Eustace heatedly. "Am I telling you about her, or are you telling me?"

"My dear old man, don't get excited. Don't you see I am trying to
construct this girl in my imagination, to visualise her? I don't
pretend to doubt your special knowledge, but after all green eyes
generally do go with red hair and there are all shades of green. There
is the bright green of meadow grass, the dull green of the uncut
emerald, the faint yellowish green of your face at the present
moment...."

"Don't talk about the colour of my face! Now you've gone and reminded
me just when I was beginning to forget."

"Awfully sorry! Stupid of me! Get your mind off it again--quick! What
were you saying? Oh, yes, this girl. I always think it helps one to
form a mental picture of people if one knows something about their
tastes--what sort of things they are interested in, their favourite
topics of conversation, and so on. This Miss Bennett now, what did she
like talking about?"

"Oh, all sorts of things."