Amezonian Indians have enviably strong teeth. To keep them that way they chew on the leaf of the Neea parviflora from childhood. Tooth decay is virtually unknown. among them. Likewise, quinine man's most potent weapon against malaria is also derived from a tree in forests. But these are just some of the"miracle drugs" to be found in"the world's greatest pharmaceu- tical factory. How many more are just waiting to be discovered ones that could prove effective against Cancer herpes the common cold.