Evolution: The modern synthesis

This classic work by Julian Huxley, first published in 1942, captured and synthesized all that was then known about evolutionary biology and gave a name to the Modern Synthesis, the conceptual structure underlying the field for most of the twentieth century. Many considered Huxley's book a popularization of the ideas then emerging in evolutionary biology, but in fact Evolution: The Modern Synthesis is a work of serious scholarship that is also accessible to the general educated public. It is a book in the intellectual tradition of Charles Darwin and Thomas Henry Huxley—Julian Huxley's grandfather, known for his energetic championing of Darwin's ideas.

(http://www.amazon.com/Evolution-Synthesis-Definitive-Julian-Huxley/dp/0262513668/ref=sr_1_2?ie=UTF8&s=books&qid=1270341132&sr=1-2)