this Ground Warbler at home in the deep woods."

"'_Skin!_' What is that?" asked Rap, as the Doctor took from his pocket
what looked merely like a dead bird.

"A 'bird-skin,' so called, is the bird preserved and prepared for
stuffing, with all its feathers on, but without glass eyes and not
mounted in a natural position. You see that it takes up much less room
than the birds that are set up in my cases, and is more easily carried
about."

"He looks like a little Thrush," said Olive, "except that he is too
green on the back, and the stripe on his head is of a dingy gold color.
That is why he is often called the 'Golden-crowned Thrush,' though he is
not a Thrush at all, but one of the American Warblers, and the crown is
more the color of copper, than like the gold on the Golden-crowned
Kinglet's head. Perhaps the Kinglet is called after new, clean gold,
and this 'Thrush' after old dusty gold."

All this time Rap had been looking intently at the Warbler without
saying a word; then he said suddenly: "Why, it's the bird that builds
the little house-nest on the ground in the river woods! The nest that is
roofed all over and has a round hole in one side for a door! I'm so glad
I know his name, for it isn't in my part of the Nuttall book and the
miller doesn't know what he is called. Is he named Ovenbird because he
has a door in one side of his nest like an oven?"

"Yes, Rap, the nest is shaped like the kind of oven that Indians used.
Tell us about the one you found."

"I was sitting on the bank where it goes down a little to the river, and
the ground there was humpy with bunches of grass. A little bird like
this Warbler ran from between two of the grass humps and picked about on
the ground for a minute and then ran back. I thought he had gone into a
hole, but pretty soon he came out again and flew up through the bushes
to a tall tree a little way off. He went out to the end of a long branch
and began to call--soft at first and then very loud, as if his throat
would split before he ended. It was a very big noise for such a little
bird."

"Did he seem to say '_Teacher_, TEACHER, TEACHER'?" asked the Doctor,
who knew John Burroughs very well.

"Yes, he kept calling exactly that way. Then when he stopped, I looked
for the hole in the ground where he came from. I felt round a little,
and then I lay down on the bank and looked up hill at the place to try
if I could find it that way. Then I saw a place where the grass and