By explaining how to sire multicolored horses, produce nuts without
shells, and create an egg the size of a human head, Giambattista Della
Porta's Natural Magic (1559) conveys a fascination with tricks and
illusions that makes it a work difficult for historians of science to
take seriously. Yet, according to William Eamon, it is in the "how-to"
books written by medieval alchemists, magicians, and artisans that
modern science has its roots. These compilations of recipes on
everything from parlor tricks through medical remedies to wool-dyeing
fascinated medieval intellectuals because they promised access to
esoteric "secrets of nature." In closely examining this rich but
little-known source of literature, Eamon reveals that printing
technology and popular culture had as great, if not stronger, an impact
on early modern science as did the traditional academic disciplines.