I am sure of it now.

We have arrested decay, or made it so slow as to be imperceptible.

But we have made many attempts to renew the old frame, and we are no farther advanced than we were nearly four years ago.

Theories will not make tissues." "What will ?" "Blood," answered Keyork Arabian very softly.
"I have heard of that being done for young people in illness," said Unorna.
"It has never been done as I would do it," replied the gnome, shaking his head and gathering his great beard in his hand, as he gazed at the sleeper.
"What would you do ?" "I would make it constant for a day, or for a week if I could--a constant circulation; the young heart and the old should beat together; it could be done in the lethargic sleep--an artery and a vein--a vein and an artery--I have often thought of it; it could not fail.

The new young blood would create new tissue, because it would itself constantly be renewed in the young body which is able to renew it, only expending itself in the old.