MIDWAY through his 900 page history of biology, zoologist Ernst Mayr considers the problem posed by Alfred Wallace. Wallace was a contemporary of Charles Darwin who independently developed a theory of speciation by means of natural selection. By the time Wallace came on the scene Darwin had been sitting on his evolutionary theory for two decades. Reading Wallace’s 1858 paper “On the Tendency of Species to Form Varities” spooked Darwin. He did not want to be scooped. Within a year Darwin had rushed his material into an “abstract which… must necessarily be imperfect” as it only gave “the general conclusions” of his theory, and offered only a “few facts in illustration” to support them. We know this abstract well: it was published as The Origin of Species.