"Perhaps; of course you couldn't be happy without being healthy; but it doesn't follow that you couldn't be healthy without being happy. I wonder in what happiness really does lie."
"I don't know; I never thought about it."
"But you should think about such things, my dear Wrexham; it is stupid of you not to, you know."
"But I cannot analyze my feelings, as you do; I am not an introspective person."
"I find nothing so interesting as the study of myself," said Isabel.
"That is very likely; but you are an interesting person and I am not; so the analysis of me would prove a most wearisome experiment."
"That has nothing to do with it. The analysis of me is instructive only so far as I am normal, and therefore uninteresting. It shows what human nature is like. When I am original I cease to be interesting from a scientific point of view."
"I am afraid I don't quite follow you."
"Can't you see that in vivisecting a frog, the more common the frog the more instructive is the experiment?"
"Yes; I can see that."