Like the character in a play by Moliere who was pleased to learn that he had been speaking prose his wholelife, Stephen Jay Gould determined at some point that his columns for the magazine Natural History were, infact, essays. They had a literary pedigree. And by Gould's own account, this discovery came as a relief. Hisuse of the first-person pronoun and his references to history and literature, while at best peculiar by thestandards of scientific writing, were embedded in the genetic code of the essay as a genre, which emergedduring the Renaissance. That was well before the sciences and the humanities had polarized into "the twocultures," speaking mutually unintelligible jargons. Indeed, the root sense of "essay" -deriving from a French verb meaning "to test" - suggests not just literary performance butlaboratory experiment.