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Authors: Robert Whitaker

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A Sunday in 1769

T
ODAY THE
E
CUADORIAN VILLAGE
of Cajabamba, which is about 110 miles south of Quito, is a place of little note. The Andean town stretches for a mile or so along the Pan American Highway, and most of the activity in the village centers on the bus stop, where vendors are lined up selling a mix of fruit, corn-on-the-cob, soup, and roasted meats. Tourists passing this way, if armed with a particularly good guidebook, might pause just long enough to scan a hillside on the north side of town, searching for a scar left by the great earthquake of 1797, which sent a flow of mud down upon the adobe homes below and killed thousands. At that time, this was a very different place. More than 16,000 people lived here, and Riobamba—as it was then called—was one of the most graceful cities in colonial Peru, home to musicians, artists, and wealthy landowners. But after the earthquake, the survivors picked up and rebuilt their town thirteen miles to the northeast, and old Riobamba gradually faded from memory. All that physically remains of the prosperous colonial city are a few ruins on the west side of Cajabamba.

However, there is one other faint echo of the past that can be found in Cajabamba. From the center of town, next to where the buses idle and the vendors linger, one can look up a long street heading east up a hill and spot a small statue. It sits in front of a school, a gold-painted bust of a rather stern-looking woman. The monument is in disrepair—the stone base is marred by graffiti, the gold paint is chipped and flaked, and the inscription is not quite readable—and few people in Cajabamba can say who the lady looking out over their town is or why she might have deserved a statue. However, in the late eighteenth century, the story of Isabel Godin became so well known that it left all of Europe spellbound. The statue was erected at the site of her colonial home, and thus it would have been from here, on the morning of October 1, 1769, that she began her most remarkable journey.

On that day, which was a Sunday, the dusty streets of Riobamba began to stir at an unusually early hour. Most mornings the town awoke slowly, the villagers waiting for the equatorial sun to chase away the nighttime chill. But this day was different. From the moment that dawn broke, people began coming out of their adobe homes, and soon many were lining up along the street that led north out of town. The wealthier women had even dressed up for the occasion, picking out their finest silk clothing to wear, and were gathered in small groups, whispering in disbelief at what was about to pass.

Isabel Godin was heading off into the Amazon.

Everyone understood her reason for going. She hoped to rejoin her husband, Jean, who was living on the northern coast of South America, in French Guiana. He had been a member of a French scientific expedition that had come to the Viceroyalty of Peru in 1736, Jean and the others hiking up and down the Andes for nearly eight years in search of an answer to a question so abstruse that few of the local people could grasp why they had come. Even so, the villagers of Riobamba had welcomed the French scientists into their midst, more so than any other community in the viceroyalty, and after the expedition had come to an end, Isabel and Jean had lived
for a time—and happily so—in Riobamba. But then, through the twists and turns of fate and the cruel politics of the time, they had become separated, Jean stranded in French Guiana and unable to return to the Spanish colony. They had now been apart for twenty years. But travel from the Andes across the Amazon? No woman had ever dared to make such a trek.

Indeed, this was a journey that only a few men had ever made. When the most famous son of the town, Pedro Maldonado, had contemplated such a journey twenty-five years earlier, his family—as a friend of his later wrote—“had sought to detain him by any means.” Maldonado’s colleagues warned him that traveling this “unknown and dangerous route” was “imprudent and reckless,” and that they personally viewed such a journey with “panicked terror.” Missionaries who traveled through the upper Amazon helped fuel such fear, for inevitably they returned with tales of how hard and perilous such travel could be.

The trip that lay ahead of Isabel stretched more than 3,000 miles. Even if all went well, it would take her six months. The route that she would follow east out of Riobamba would skirt around towering Mount Tungurahua, a volcano known to spit fire and rocks into the sky. The path would then disappear into a deep canyon and tumble quickly out of the Andes into a gloomy rain forest filled with the nerve-wracking cries of howler monkeys. From there, she would have to travel by dugout canoe down the turbulent headwaters of the Amazon, passing through a jungle that was home to clouds of insects and populated by any number of poisonous snakes and wild beasts, including the much feared American “tiger,” which was believed to have quite an appetite for human flesh. Other hazards, wrote one eighteenth-century explorer who had gone this route, included “naked savages” who “eat their prisoners.”

In the center of town, the scene was growing ever more chaotic. Isabel had hired thirty-one Indian porters to transport her goods on the first leg of the journey, overland to the Rio Bobonaza, and they were busy packing a long line of mules. Isabel’s traveling party had
grown, too. Her two brothers had decided to come along to assure her safety, and one had decided—in a burst of questionable judgment—to bring along his eldest son, figuring that this would provide an opportunity to take him to Europe, where he could get a better education. Rumors of her impending trek had also spread far beyond Riobamba and had brought two strangers to her door, a French doctor and his traveling companion. They had been making their way along the Peruvian coast and now saw a trip across the Amazon as a more intriguing way to return to France. Both groups were bringing along servants as well: Isabel and her two brothers had two maids and a Negro slave, while the French doctor had one personal attendant, bringing the total number in Isabel’s party to forty-one.

Isabel had been advised to travel as lightly as possible—advice that she found difficult to heed. There was the gear that they needed for the journey—blankets, ponchos, and food—and her many possessions. She was, after all, now
moving
to France. Fancy dresses, skirts, shawls, gold-buckled shoes, lace-trimmed underwear, and silver-studded belts were just a start. Next came the silver bowls, the fine china, the gold rosaries, the earrings set with emeralds, and various fancy linens. One reed basket after another was filled to the brim, the mules braying as cinches were tightened and the baskets heaved onto their backs.

Yet amid this confusion and bustle, Isabel appeared the picture of elegance and charm. She had stepped from her house that morning looking as though she were planning an evening at a lively dance. She wore a light-colored dress that billowed out from her waist, dainty cotton shoes, several silver bracelets, and two gold necklaces. Her appearance reflected who she was: a Riobamban woman who had lived all of her adult life in this village, rarely traveling far from home and enjoying the luxuries that came with being part of the elite class in colonial Peru. She was forty-one years old, a little plump, and the first streaks of white could be seen in her coal-black hair. She, like the other women of Riobamba, had simply dressed up for the occasion.

At last, the train of pack mules began to move. The procession of animals and men headed slowly down the town’s main street, kicking up so much dust that Isabel’s friends, waving to her as she went by, held scarves to their mouths. The mules brayed, Isabel’s two brothers and several of the others rode horses, and Isabel drew up the rear. She was carried aloft in a sedan chair, the Indian porters having been given orders to jostle her as little as possible.

CHAPTER TWO

Not Quite Round

T
HE CHAIN OF EVENTS
that led Isabel Godin to that moment in 1769, when she set off on her trek into the Amazon, had begun more than thirty-five years earlier, in a place far from her Peruvian home. At that time, a debate was raging in European scientific circles, one that was roiling the august halls of the French Academy of Sciences. The English were squaring off with the French, young scientists in the academy were battling their mentors, and tempers were such that when Voltaire jumped into the fray, with his customary stinging wit and on the side of the English, his book was summarily burned and he was forced to flee Paris. The question at hand was a profound one: What was the
precise
size and shape of the earth? And even more important, what did that shape reveal about the laws of gravitation and planetary motion that governed the universe?

Although the argument may have turned rancorous, the fact that this question had become the most pressing scientific topic of the day, one savored by the educated public in Paris and London, represented a coming-of-age for the Enlightenment. The roots of
this transforming movement dated back more than a century to the writings of the English philosopher Francis Bacon and the French mathematician René Descartes. In his
Discourse on Method
, Descartes argued that in order to know the world, it was necessary to doubt all accepted wisdom. That was a heretical idea in 1637, for it meant questioning Christian doctrines about the natural world. Once the mind was emptied of such beliefs, Descartes wrote, insight could arise from
“an unclouded and attentive mind, which springs from the light of reason.” Seventeenth-century intellectuals adopted this faith in reason as their operating manifesto, even though it brought them into conflict with religious authorities. This approach produced a steady flow of achievements in astronomy, mathematics, and mapmaking, and as it did so, the literate public in France and England developed a keen interest in science, which, in the early eighteenth century, blossomed into the Enlightenment.

Paris, a city with a population of 500,000 in 1734, was at the epicenter of this revolution in thought. Upper-class men and women regularly gathered in sitting rooms to discuss art, philosophy, and science. Periodicals carried announcements of public lectures on these topics, which drew standing-room-only crowds. Lending libraries were created and stocked with books on science. As a historian of eighteenth-century France wrote,
“Science was the true passion of the century at all literate levels of society, in every urban center of France, and even among the progressively minded gentleman-farmers.”

The debate over the size and shape of the earth, which erupted in full force in the 1720s, resonated in particular with the French public. As the members of the French Academy of Sciences proudly wrote, this question had a long history and was so elemental that the intellectual progress of human civilization could be charted by following the steps that societies had made in solving it.

S
CHOLARS IN
ancient Greece and other early civilizations believed that the earth was flat, which is how it appears to the untutored
eye. The idea that the earth might be a sphere, freely floating in space, was first advanced in the sixth century
B.C
. by the Greek philosopher Pythagoras. Aristotle subsequently provided evidence for this notion. The height of the sun, he noted, changed as one traveled north or south. And that could only be so, he pointed out, if one were traveling along a curve that altered one’s line of sight. He estimated that the earth’s circumference was 400,000 stades (about 40,000 miles).

Around 235
B.C
., the Greek scholar Eratosthenes, who was head of the royal library in Alexandria, came up with a clever idea for actually calculating the earth’s size. He had heard that there was a well in the town of Syene where the sun cast no shadow at noon on the summer solstice. That meant that the sun must be directly overhead at that moment. Alexandria was thought to be located directly north of Syene, and in Alexandria, at noon on the summer solstice, the sun cast a shadow equal to one-fiftieth of a circle (7.2 degrees). The distance between the two cities was thus one-fiftieth of the earth’s circumference. Eratosthenes estimated the cities to be 5,000 stades apart—camel caravans traveling 100 stades a day took fifty days to travel from one city to the other—and thus he concluded that the earth’s circumference was 250,000 stades.

His was obviously a rough calculation. He could not be certain that Alexandria was located directly north of Syene, and his estimate of the distance between the two cities was little better than a guess. However, Eratosthenes had come up with a sound theoretical method for determining the earth’s size. First, measure the distance between two points along a north-south line, which is known as a meridian.
*
Next, measure the angle to the sun from each of the two points, which reveals how far apart those two points are in degrees. That is all the data needed to determine the earth’s size. Posidonius applied these principles in the first century
B.C
. and concluded that the earth’s circumference was 240,000 stades, a figure that the Greek geographer Strabo later revised to 180,000 stades (about 18,000 miles).

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