t books on some of the
subjects that most interest me. I know about bones and muscles and all
that, and about digestion and respiration and such things. I want to
study up the nervous system, and learn all about it. I am of the nervous
temperament myself, and perhaps that is the reason. I want to read about
insanity and all that relates to it."

A curious expression flitted across the doctor's features as The Terror
said this.

"Nervous system. Insanity. She has headaches, I know,--all those
large-headed, hard-thinking girls do, as a matter of course; but what has
set her off about insanity and the nervous system? I wonder if any of
her more remote relatives are subject to mental disorder. Bright people
very often have crazy relations. Perhaps some of her friends are in that
way. I wonder whether"--the doctor did not speak any of these thoughts,
and in fact hardly shaped his "whether," for The Terror interrupted his
train of reflection, or rather struck into it in a way which startled
him.

"Where is the first volume of this Medical Cyclopaedia?" she asked,
looking at its empty place on the shelf.

"On my table," the doctor answered. "I have been consulting it."

Lurida flung it open, in her eager way, and turned the pages rapidly
until she came to the one she wanted. The doctor cast his eye on the
beading of the page, and saw the large letters A N T.

"I thought so," he said to himself. "We shall know everything there is
in the books about antipathies now, if we never did before. She has a
special object in studying the nervous system, just as I suspected. I
think she does not care to mention it at this time; but if she finds out
anything of interest she will tell me, if she does anybody. Perhaps she
does not mean to tell anybody. It is a rather delicate business,--a
young girl studying the natural history of a young man. Not quite so
safe as botany or palaeontology!"

Lurida, lately The Terror, now Miss Vincent, had her own plans, and chose
to keep them to herself, for the present, at least. Her hands were full
enough, it might seem, without undertaking the solution of the great
Arrowhead Village enigma. But she was in the most perfect training, so
far as her intelligence was concerned; and the summer rest had restored
her bodily vigor, so that her brain was like an overcharged battery which
will find conductors somewhere to carry off its crowded energy.

At this time Arrowhead Village was enjoying the most s