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.

“All life on earth - everything from bacteria to mushrooms to hippos - shares an astonishing range of detailed biochemical similarities, including the structure of heredity in DNA and RNA, and the universal use of ATP as an energy-storing compound. Two possible scenarios, with markedly different implications for the nature of life, might explain these regularities: either all earthly life shares these features because no other chemistry can work, or these similarities only record the common descent of all organisms on earth from a single origin that happened to feature this chemistry as one possibility among many.”

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

"War of the Worldviews", p. 352
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“When puzzled, it never hurts to read the primary documents—a rather simple and self-evident principle that has, nonetheless, completely disappeared from large sectors of the American experience.”

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

"Non-Overlapping Magisteria", p. 273
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Theories rarely arise as patient inferences forced by accumulated facts. Theories are mental constructs potentiated by complex external prods (including, in idealized cases, a commanding push from empirical reality). But the prods often include dreams, quirks, and errors—just as we may obtain crucial bursts of energy from foodstuffs or pharmaceuticals of no objective or enduring value. Great truth can emerge from small error. Evolution is thrilling, liberating, and correct. And Macrauchenia is a litoptern.”

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

"Mr. Sophia's Pony", pp. 157 - 158
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Flies can eat toads! (Although astonishment may be lessened in noting that the tiny toads are much smaller than enormous fly larvae.) Unusually large insects and maximally small vertebrates have also been featured in the few other recorded cases of such reversals - frogs, small birds, even a mouse, consumed by praying mantids, for example.”

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

"Reversing Established Orders", p. 396
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“South America had been an island continent, far bigger and far more diverse than Australia, for tens of millions of years before the Isthmus of Panama rose just a couple of million years ago. The resulting flood of North American mammals across the new land bridge corresponds in time with the decimation of the native South American fauna. In fact, most large mammals generally considered distinctly South American… are all recent migrants from North America.”

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

"Can We Truly Know Sloth and Rapacity?" pp. 390
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Since the universe must contain millions of appropriate planets, consciousness in some form - but not with the paired eyes and limbs, and the brain built of neurons in the only example we know - may evolve frequently. But if only one origin of life in a million ever leads to consciousness, then Martian bacteria most emphatically do not imply Little Green Men.)”

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)

“Henry Fairfield Osborn, the dominant paleontologist of his era, and long time director of the American Museum of Natural History, gave the "standard version in his popular book of 1918, The Origin and Evolution of Life… "Lamarck attributed the lengthening of the [giraffe's] neck to the inheritance of bodily modifications caused by the neck-stretching habit. Darwin attributed the lengthening of the neck to the constant selection of individuals and races which were born with the longest necks. Darwin was probably right."”

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

…The version has held ever since.
"The Tallest Tale", p. 314
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Why, then, have we been bamboozled into accepting the usual tale without questioning? I suspect two primary reasons: we love a sensible and satisfying story, and we are disinclined to challenge apparent authority (like textbooks!). But do remember that most satisfying tales are false.”

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

"The Tallest Tale", p. 318
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Our indirect methods have taught us a mountain of things about horses, but if you wished to learn even more, would you rather be Whirlaway in the stretch, than interview Eddie Arcaro afterwards?”

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

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

“Natural historians tend to avoid tendentious preaching in this philosophical mode (although I often fall victim to such temptations in these essays). Our favored style of doubting is empirical: if I wish to question your proposed generality, I will search for a counterexample in flesh and blood. Such counterexamples exist in abundance, for they form a staple in a standard genre of writing in natural history — the “wonderment of oddity” or “strange ways of the beaver” tradition.”

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

"Reversing Established Orders", p. 394
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Lernaeodiscus porcellanae turns control of the host into a fine art. After castration by the parasite, male crabs develop female characteristics in both anatomy and behavior, while females become even more feminized. The emerging externa then takes the same form and position as the crab's own egg mass… The crabs then treat the externa as their own brood. In other words, the parasite usurps all the complex care normally invested in the crab's own progeny.”

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

Triumph of the Root-Heads, p. 368
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Gaskell… had to keep his stately soldiers upright and uniformly oriented… by crafting the brain and spinal cord from an arthropod digestive tube, while forming a completely new gut below. …Gaskell thought that his move would rescue the theory of linear progress, with its necessary transition of arthropod into vertebrate, from the absurdities of the old inversion theory.”

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)

“We can now determine, easily and relatively cheaply, the detailed chemical architecture of genes; and we can trace the products of these genes (enzymes and proteins) as they influence the course of embryology. In so doing we have made the astounding discovery that all complex animal phyla - arthropods and vertebrates in particular - have retained, despite their half-billion years of evolutionary independence, an extensive set of common genetic blueprints for building bodies.”

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

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

“Eternal vigilance, as they say, is the price of freedom. Add intellectual integrity to the cost basis.”

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

"The Tallest Tale", p. 315
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“If we choose a weak and foolish speculation as a primary textbook illustration (falsely assuming that the tale possesses a weight of history and a sanction of evidence), then we are in for trouble - as critics properly nail the particular weakness, and then assume that the whole theory must be in danger if supporters choose such a fatuous case as a primary illustration.”

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

"The Tallest Tale", p. 314
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Very little comes easily to our poor, benighted species (the first creature, after all, to experiment with the novel evolutionary inventions of self-conscious philosophy and art). Even the most “obvious,” “accurate,” and “natural” style of thinking or drawing must be regulated by history and won by struggle. Solutions must therefore arise within a social context and record the complex interactions of mind and environment that define the possibility of human improvement.”

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

"Seeing Eye to Eye, Through a Glass Clearly", p. 72
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Arthropods and vertebrates share some broad features of general organization - elongated, bilaterally symmetrical bodies, with sensory organs up front, excretory structures in the back, and some form of segmentation along the major axis. But the geometry of major internal organs could hardly be more different… Arthropods concentrate their nervous system on their ventral (belly) side as two major cords running along the bottom surface of the animal. The mouth also opens on the ventral side, with the esophagus passing between the two nerve cords, and the stomach and remainder of the digestive tube running along the body above the nerve cords. In vertebrates, and with maximal contrast, the central nervous system runs along the dorsal (top) surface as a single tube culminating in a bulbous brain at the front end. The entire digestive system then runs along the body axis below the nerve cord.”

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

"Brotherhood by Inversion", p. 321
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“No one supposed that dinoflagellates might actively kill fish as an evolved response for their own specific advantage, including a potential nutritional benefit for the algal cells. And yet the dinoflagellates do seem to be killing and eating fishes in a manner suggesting active evolution for this most peculiar reversal.”

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

"Reversing Established Orders", p. 400
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“The classical argument for why a supposedly decent and moral creature like Homo sapiens can mistreat and even extirpate other species rests upon an extreme position in a continuum. The Cartesian tradition, formulated explicitly in the seventeenth century, but developed in "folk" and other versions throughout human history no doubt, holds that other animals are little more than unfeeling machines, with only humans enjoying "consciousness," however defined.”

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

"Can We Truly Know Sloth and Rapacity?" pp. 389
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Consider one of the standard "laments" or "stories of wonder" in conventional tales of natural history: the mayfly that lives but a single day (a sadness even recorded in the technical name for this biological group - Ephemoptera). Yes, the adult fly may enjoy only a moment in the sun, but we should honor the entire life cycle and recognize that the larvae, or juvenile stages, live and develop for months. Larvae are not mere preparations for a brief adulthood. We might better read the entire life cycle as a division of labor, with larvae as feeding and growing stages, and the adult as a short-lived reproductive machine. In this sense, we could well view the adult fly's day as the larva's clever and transient device for making a new generation of truly fundamental feeders.”

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)