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.

“We now live, as Earth always has (see my 1996 book Full House), in an Age of Bacteria. These simplest organisms will dominate our planet (if conditions remain hospitable for life at all) until the sun explodes. During our current, and undoubtedly brief, geological moment, they watch with appropriate amusement as we strut and fret our hour upon the stage. For we are, to them, only transient and delectable islands ripe for potential exploitation.”

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)

“The parasite has somehow evolved to turn off the host's defenses, presumably by disarming the crab's immune response with some chemical trickery that fools the host into accepting the parasite as part of itself. …The adult parasite castrates the host, not by directly eating the gonadal tissue, but by some unknown mechanism probably involving penetration of the interna's roots around and into the crab's nervous system.”

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

Triumph of the Root-Heads, p. 367
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Darwin himself told us in his last book (The Formation of Vegetable Mould Through the Action of Worms) that we should never underestimate the power of worms on the move…. The inversion of a humble worm, especially when disturbed, may bring down empires. Shakespeare told us that "the smallest worm will turn being trodden on." And Cervantes wrote in his author's preface to Don Quixote that "even a worm when trod upon, will turn again." …Geoffrey, it seems, was correct after all - not in every detail, of course, but at least in basic vision and theoretical meaning. And the triumph of surprise, the inversion of nuttiness to apparent truth, stands as a premier example of the most exciting general development in evolutionary theory during our times.”

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

"Brotherhood by Inversion", p. 329-330
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Darwinian evolution may be the most truthful and powerful idea ever generated by Western Science, but if we continue to illustrate our conviction with an indefensible, unsupported, entirely speculative, and basically rather silly story, then we are clothing a thing of beauty in rags - and we should be ashamed, "for the apparel oft proclaims the man."”

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)

“If the neck of the giraffe elongates an inch at a time, then the full panoply of supporting structures need not arise at every step. The coordinated adaptation can be built piecemeal. Some animals may slightly elongate the neck, others the legs; still others may develop stronger neck muscles. By sexual reproduction, the favorable features of different organisms may be combined in offspring.”

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

"The Tallest Tale", p. 310
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“If we make this readjustment to view Homo sapiens as an ultimate in oddball rarity, and life at bacterial grade as the common expression of a universal phenomenon, then we could finally ask the truly fundamental question raised by the prospect of Martian fossils. If life originates as a general property of the material universe under certain conditions (probably often realized), then how much can the basic structure and constitution of life vary from place to independent place?”

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)

“In short, the root-head turns the crab into a Darwinian cipher, a feeding machine working entirely in the parasite's service. The castrated crab can make no contribution to its own evolutionary history; its "Darwinian fitness" has become flat zero. …But ever so carefully, for the parasite must maintain the crab in constant and perfect servitude - not draining the host enough to kill this golden goose, but not letting the crab do anything for its own Darwinian benefit.”

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

Triumph of the Root-Heads, p. 369
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“When scientists need to explain difficult points of theory, illustration by hypothetical example - rather than by total abstraction - works well (perhaps indispensably) as a rhetorical device. Such cases do not function as speculations in the pejorative sense - as silly stories that provide insight into complex mechanisms - but rather as idealized illustrations to exemplify a difficult point of theory. (Other fields, like philosophy and the law, use such conjectural cases as a standard device.)”

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

"The Tallest Tale", p. 310
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I am willing to believe that my unobtainable sixty seconds within a sponge or a flatworm might not reveal any mental acuity that I would care to call consciousness. But I am also confident […] that vultures and sloths, as close evolutionary relatives with the same basic set of organs, lie on our side of any meaningful (and necessarily fuzzy) border—and that we are therefore not mistaken when we look them in the eye and see a glimmer of emotional and conceptual affinity.”

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

"Can We Truly Know Sloth and Rapacity?" pp. 389–390
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“What constitutes the primordium of the adult parasite [ Rhizocephala ]? What can be injected through the narrow opening of the dart's hypodermic device? …Imagine going through such complexity as nauplius, cyprid, and kentrogon - and then paring yourself down to just a few cells for a quick and hazardous transition to the adult stage. What a minimal bridge at such a crucial transition! …But other species have achieved the ultimate reduction to a single cell! The dart injects just one cell into the host's interior, and the two parts of the life cyle maintain their indispensable continuity by an absolutely minimal connection - as though, within the rhizocephalan life cycle, nature has inserted a stage analogous to the fertilized egg that establishes minimal connection between generations in ordinary sexual organisms.”

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

Triumph of the Root-Heads, p. 363
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“The giraffe's neck supposedly supplies a crucial example for preferring natural selection over Lamarckism as a cause of evolution. But Darwin himself (however wrongly by later judgement) did not deny the Lamarckian principle of inheritance for characters acquired by use or lost by disuse. He regarded the Lamarckian mechanism as weak, infrequent, and entirely subsidiary to natural selection, but he accepted the validity of evolution by use and disuse. Darwin does speculate about the adaptive advantage of giraffe's necks, but he cites both natural selection and Lamarckism as probable causes of elongation.”

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

"The Tallest Tale", p. 312
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Independent derivation meshed beautifully with the triumph, from the 1930's on, of a strict version of Darwinism based on the near ubiquity of adaptive design built by natural selection… Arthropods and vertebrates do share several features of functional design. But those similarities only reflect the power of natural selection to craft optimal structures independently in a world of limited biomechanical solutions to common functional problems - an evolutionary phenomenon called convergence.”

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

"Brotherhood by Inversion", p. 328
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“When we look to presumed sources of origin for competing evolutionary explanations of the giraffe's long neck, we find either nothing at all, or only the shortest of speculative conjectures. Length, of course, need not correspond with importance. Garrulous old Polonius, in a rare moment of clarity, reminded us that "brevity is the soul of wit" (and then immediately vitiated his wise observation with a flood of woolly words about Hamlet's Madness.)”

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

"The Tallest Tale", p. 304
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“In France, Étienne Geoffroy Saint-Hilaire attempted to portray the skeleton of vertebrates as a set of modifications upon an archetypal vertebra. In the 1820's, Geoffroy extended his ambitious plan to include annelids and arthropods under that same rubric. …Vertebrates support their soft parts with an internal skeleton, but insects must live within their vertebrae (a reality, not a metaphor, for Geoffroy). This comparison led to… the claim that a vertebrate rib must represent the same organ as an arthropod leg - and that insects must therefore walk on their own ribs!”

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)

“Each and every loss becomes an instance of ultimate tragedy—something that once was, but shall never be known to us. The hump of the giant deer—as a nonfossilizable item of soft anatomy—should have fallen into the maw of erased history. But our ancestors provided a wondrous rescue, and we should rejoice mightily. Every new item can instruct us; every unexpected object possesses beauty for its own sake; every rescue from history's great shredding machine is—and I don't know how else to say this—a holy act of salvation for a bit of totality.”

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

"A Lesson from the Old Masters", p. 195
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“I have a great respect for religion, and the subject has always fascinated me […]. Much of this fascination lies in the stunning historical paradox that organized religion has fostered, throughout Western history, both the most unspeakable horrors and the most heartrending examples of human goodness in the face of personal danger. (The evil, I believe, lies in an occasional confluence of religion with secular power. The Catholic Church has sponsored its share of horrors, from Inquisitions to liquidations—but only because this institution held great secular power during much of Western history. When my folks held such sway, more briefly and in Old Testament times, we committed similar atrocities with the same rationales.)”

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

"Non-Overlapping Magisteria", p. 281
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“[T]ruly grand and powerful theories […] do not and cannot rest upon single observations. Evolution is an inference from thousands of independent sources, the only conceptual structure that can make unified sense of all this disparate information. The failure of a particular claim usually records a local error, not the bankruptcy of a central theory. […] If I mistakenly identify your father's brother as your own dad, you don't become genealogically rootless and created de novo.”

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

You still have a father; we just haven't located him properly.
"Mr. Sophia's Pony", p. 155
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Unfortunately, all life on earth - the only life we know - represents, for all its current variety, the results of a single experiment, for every earthly species evolved from the common ancestry of a single origin. We desperately need a repetition of the experiment (several would be better, but let's not be greedy!) in order to make a judgement. Mars represents our first real hope for a second experiment - the sine qua non”

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

for any proper answer for the question of questions.
"War of the Worldviews", p. 353
Leonardo's Mountain of Clams and the Diet of Worms (1998)

“Darwinian natural selection only yields adaptation to changing local environments, and better function in an immediate habitat might just as well be achieved by greater simplicity in form and behavior as by ever-increasing complexity.”

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) Triumph of the Root-Heads, p. 355

“Gaskell could not abide this indecorous version of his beloved linear progress theory. He could not bear to imagine that the grand procession from jellyfish to man, orchestrated by an ever-increasing mass of nervous tissue, once paused in its stately and orderly march toward human consciousness in order to execute a fancy little flip, a clever jig of inversion, just at the sublime and definitive moment of entrance into the vertebral home stretch.”

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)

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