these things?"

"Of course," said I. "But these foul creatures of yours--"

"All in good time," said he, waving his hand at me; "I am only beginning.
Those are trivial cases of alteration. Surgery can do better things
than that. There is building up as well as breaking down and changing.
You have heard, perhaps, of a common surgical operation resorted to in
cases where the nose has been destroyed: a flap of skin is cut from
the forehead, turned down on the nose, and heals in the new position.
This is a kind of grafting in a new position of part of an animal
upon itself. Grafting of freshly obtained material from another
animal is also possible,--the case of teeth, for example.
The grafting of skin and bone is done to facilitate healing:
the surgeon places in the middle of the wound pieces of skin snipped
from another animal, or fragments of bone from a victim freshly killed.
Hunter's cock-spur--possibly you have heard of that--flourished on
the bull's neck; and the rhinoceros rats of the Algerian zouaves are
also to be thought of,--monsters manufactured by transferring a slip
from the tail of an ordinary rat to its snout, and allowing it to heal in
that position."

"Monsters manufactured!" said I. "Then you mean to tell me--"

"Yes. These creatures you have seen are animals carven and wrought
into new shapes. To that, to the study of the plasticity of
living forms, my life has been devoted. I have studied for years,
gaining in knowledge as I go. I see you look horrified, and yet I
am telling you nothing new. It all lay in the surface of practical
anatomy years ago, but no one had the temerity to touch it.