I have greatly admired Stephen J. Gould's essays over the years because I generally find them clear and humane. I tend to agree with most of his evolutionary views, although I think that he pushes too much the roles of contingency and natural selection in the history of life. Certainly, there are other biological mechanisms acting on evolutionary change, some of which have been brilliantly discussed by Stuart Kauffman in his book "At Home in the Universe." In any case, in "Leonardo's Mountain of Clams and the Diet of Worms," Gould again presents us with some food for thought. I found the essay on the separation of the scientific and religious realms of thought ("Non-Overlapping Magisteria") quite appropriate for people in the United States in particular, but my favorites were "A Lesson from the Old Masters," "Brotherhood by Inversion (or, As the Worm Turns)" and "Triumph of the Root-Heads," not only because Gould is at the top of his writing skills explaining difficult biological or paleontological ideas, but because the phenomena themselves are so incredible. Other essays were somewhat trivial (I really didn't see much in "Can We Truly Know Sloth and Rapacity?") and even forced (despite its undeniable humane message, "The Diet of Worms and the Defenestration of Prague" comes to my mind). I would imagine that, despite Gould's impressive intellectual talents, meeting a monthly schedule for "Natural History" magazine for such a long time in some instances must result in repetition and lack of interesting subjects to write about. If you are an avid Gould reader, however, this book will not dissapoint you.