Quotes from book
Leonardo's Mountain of Clams and the Diet of Worms

Leonardo's Mountain of Clams and the Diet of Worms
Stephen Jay Gould

Leonardo's Mountain of Clams and the Diet of Worms is the eighth volume of collected essays by the Harvard paleontologist Stephen Jay Gould. The essays were culled from his monthly column "The View of Life" in Natural History magazine, to which Gould contributed for 27 years. The book deals, in typically discursive fashion, with themes familiar to Gould's writing: evolution and its teaching, science biography, probabilities and common sense.

“Many similarities of basic design among animal phyla, once so confidently attributed to convergence, and viewed as testimony to the power of natural selection to craft exquisite adaptation, demand the opposite interpretation that Mayr labeled as inconceivable: the similar features are homologies, or products of the same genes, inherited from a common ancestor and never altered enough by subsequent evolution to erase their comparable structure and function. The similarities record the constraining power of conserved history, not the architectural skills of natural selection independently pursuing an optimal design in separate lineages. Vertebrates are, in a certain sense, true brothers (or homologs) - not mere analogs - of worms and insects.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 330-31
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I am particularly fond of [Emmanuel Mendes da Costa's] Natural History of Fossils because this treatise, more than any other work written in English, records a short episode expressing one of the grand false starts in the history of natural science—and nothing can be quite so informative and instructive as a juicy mistake.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Clam Stripped Bare by Her Naturalists, Even", p. 93
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“The intricate and different life cycles of both male and female root-heads, and the great behavioral sophistication shown by the female in reconfiguring a host crab as a support system, all underscore the myopia of our conventional wisdom in regarding rhizocephalans as degenerate parasites because the adult anatomy of internal roots and external sac seem so simple.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

Triumph of the Root-Heads, p. 371
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I love these tales because, in more reasonable attributions of motive, they so beautifully embody a fundamental theme of historical explanation - that consequences of substantial import often arise from triggers of entirely different intent. In other words, current utility bears no necessary relationship with historical origin.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Tallest Tale", p. 302
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I can only look from the outside (or cut into the inside, but flesh and genes do not reveal organic totality). I am stuck with a panoply of ineluctably indirect methods - some very sophisticated to be sure. I can atomize, experiment, and infer. I can record reams of data about behaviors and responses. But if I could be a beetle or a bacillus for that one precious minute - and live to tell the tale in perfect memory - then I might truly fulfill Darwin's dictum penned into an early notebook containing the first full flowering of his evolutionary ideas during the late 1830's: "He who understands the baboon would do more towards metaphysics than Locke."”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Can We Truly Know Sloth and Rapacity?" pp. 376
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“This essay treats the most celebrated story in the extreme simplification in an adult parasite - in the interests of illuminating, reconciling, and, perhaps, even resolving two major biases that have so hindered our understanding of natural history: the misequation of evolution with progress, and the undervaluing of an organism by considering only its adult form and not the entire life cycle.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

Triumph of the Root-Heads, p. 356
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Evolving life must experience a vast range of possibilities, based on environmental histories so unpredictable that no realized route - the pathway to consciousness in the form of Homo sapiens or Little Green Men, for example - can be construed as a highway to heaven, but must be viewed as a tortuous track rutted with uncountable obstacles and festooned with innumerable alternative branches. Any reasonably precise repetition of our earthly route on another planet therefore becomes wildly improbable even in a trillion cases.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"War of the Worldviews", p. 351
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“A very sincere and serious freshman student came to my office with a question that had clearly been troubling him deeply. He said to me, “I am a devout Christian and have never had any reason to doubt evolution, an idea that seems both exciting and well documented. But my roommate, a proselytizing evangelical, has been insisting with enormous vigor that I cannot be both a real Christian and an evolutionist. So tell me, can a person believe both in God and in evolution?” Again, I gulped hard, did my intellectual duty, and reassured him that evolution was both true and entirely compatible with Christian belief—a position that I hold sincerely, but still an odd situation for a Jewish agnostic.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Non-Overlapping Magisteria", p. 270
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“The inversion theory has a long and fascinating history in the discussion of vertebrate origins. The founding version dates to the early nineteenth century and became the centerpiece of a movement often called "transcendental biology," and centered on the attempt to reduce organic diversity to one or a very few archetypal building blocks that could generate all actual anatomies as products of rational laws of transformation. Some of Europe's greatest thinkers participated in this grand, if flawed enterprise. Goethe, Germany's preeminent poet-scientist, tried to explain the varied parts of plants as different manifestations of an archetypal leaf.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 325
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Geoffrey also recognized that the opposite orientations of gut and nervous system posed a problem for his claim that insects and vertebrates represent different versions of the same archetypal animal - and he proposed the first account of the inversion theory to resolve this threat to unification. …Geoffroy pursued the… aim of establishing a "unity of type" that could generate both arthropods and vertebrates from the same basic blueprint. …The single grand design includes a gut in the middle and the main nerve cords somewhere on the periphery.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 326
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“If I could have those sixty seconds within Bradypus… would I not receive a plea for humans to pause, reassess - and above all, slow down?”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Can We Truly Know Sloth and Rapacity?" pp. 391
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“In our struggle to understand the history of life, we must learn where to place the boundary between contingent and unpredictable events that occur but once and the more repeatable, lawlike phenomenon that may pervade life's history as generalities.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Reversing Established Orders", p. 402
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Very few people, including authors willing to commit to paper, ever really read primary sources—certainly not in necessary depth and comtemplation, and often not at all. […] When writers close themselves off to the documents of scholarship, and then rely only on seeing or asking, they become conduits and sieves rather than thinkers. When, on the other hand, you study the great works of predecessors engaged in the same struggle, you enter a dialogue with human history and the rich variety of our own intellectual traditions. You insert yourself, and your own organizing powers, into this history—and you become an acive agent, not merely a “reporter.””

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

Introduction, p. 6
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I went to the movies to see Independence Day, the outer-space summer blockbuster of 1996. (Even the most committed intellectual can't survive on an unalloyed diet of Jane Austen remakes.)”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Dodo in the Caucus Race", p. 232
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Giraffes do use their long necks to browse leaves, at the tops of acacia trees - but such current function, no matter how vital, does not prove that the neck originally evolved for this purpose. The neck may have first lengthened in context of a different use, and then been coopted for better dining when giraffes moved into the open plains. Or the neck may have evolved to perform several functions at once. We cannot learn the reasons for historical origin simply by listing current uses.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Tallest Tale", p. 317
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Nearly anyone in this line of work would take a bullet for the last pregnant dodo. But should we not admire the person who, when faced with an overwhelmingly sad reality beyond and personal blame or control, strives valiantly to rescue whatever can be salvaged, rather than retreating to the nearest corner to weep or assign fault?”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Dodo in the Caucus Race", p. 234
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Later evolutionary theorists of linear progress had to advance the overtly physical and historical claim that an ancestral lineage of arthropods actually turned over to become the first vertebrates (for the classical statement of the inversion theory, see William Patten, The Grand Strategy of Evolution, 1920).”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

Source: Leonardo's Mountain of Clams and the Diet of Worms (1998) "Brotherhood by Inversion", p. 327

“We may summarize the main line of this complexly meandering tale as a list of ironies - invoking the technical definition of irony as a statement where, for humorous or sarcastic effect, the intended meaning of a word becomes directly opposite to the usual sense…”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"The Tallest Tale", p. 313
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“This new consensus seemed so compelling that Ernst Mayr, the dean of modern Darwinians, opened the ashcan of history for a deposit of Geoffrey's ideas about anatomical unity.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 329
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“How ironic. In order to avoid the "nutty" theory of inversion, Gaskell invented the even odder notion of stomachs turning into brains with new guts forming below. No wonder then, that later biologists cast a plague on both speculative houses and opted instead for the obvious alternative: arthropods and vertebrates do not share the same anatomical plan at all, but rather represent two separate evolutionary developments of similar complexity from a much simpler common ancestor that grew neither a discrete gut nor a central nerve cord.”

Stephen Jay Gould book Leonardo's Mountain of Clams and the Diet of Worms

"Brotherhood by Inversion", p. 327
Leonardo's Mountain of Clams and the Diet of Worms (1998)