It was not to be. The mosquito has become resistant to DT; malaria is on the rise; although tapeworms rarely turn up any longer in the most lovingly prepared New York City gefilte fish, a worm may inhabit your sashimi; some strains of gonorrhea actually thrive on penicillin; there is even a parasite for the higher tax brackets--the nymph of Nantucket; and there are new ailments--legionnaire's disease, Lassa fever, and new strains of influenza In the long run, one might bet on the insects and the germs. Meanwhile Dr. Robert Desowitz has written a delightful and instructive book.