If the blood of a carrier was replaced any time during the first five years, the bugs in the residual blood in the body began to propagate again, delaying the aging process another five years. "In other words," I was told, "we can control the symbiote. Mankind can reap the benefits--with not a single one of the dangers." Except poor Zealley, I thought pityingly, but wonderingly. The hogs, the smart boys who have every angle figured in getting the jump on everybody else--how is it they never figure the last angle? He should have waited instead of grabbing. End of the Project Gutenberg EBook of Metamorphosis, by Charles V. de Vet