Читать книгу The Miraculous Fever-Tree: Malaria, Medicine and the Cure that Changed the World - Fiammetta Rocco - Страница 6

‘Cinchona revolutionised the art of medicine as profoundly as gunpowder had the art of war.’

BERNARDO RAMAZZINI, physician to the Duke of Modena, Opera omnia, medica et physica (1717)

Francesco Torti’s ‘Tree of Fevers’ may be nearly three hundred years old, but it swells on the page as though it rose from the ground this very spring. At the crown, its trunk branches like an earthly anemone, and its arms grow thick and dark. On the left side of the engraving, the tree bark hums with sap and leaves grow at intervals in thick bunches of green. The branches on the right, by contrast, are denuded and leafless. Tissue-white, they curl upwards as if in supplication to the Almighty.

Torti, who once saved his own life by taking a dose of powdered Peruvian quinine bark to cure an intermittent fever, as malaria was once called, believed that there were two kinds of fever: those, represented by the leafy branches on the left side of his tree, that respond to treatment with the bark; and those, like the dead willowy kind, that do not.

But Torti took his inspiration from another tree, one that he had never seen, and one that for centuries would remain an enigma. The magnificent Cinchona calisaya, the red-barked Andean tree that produces quinine, is one of ninety varieties of cinchona, a relative of the madder family, which also includes coffee and gardenias. Some cinchonas have large leaves, some small; some smooth, some roughly corrugated. But the leaves on the older trees of the true red bark – the cascarilla roja that grows eighty feet high – are fiery red. The colour offsets the lilac-like flowers that grow in delicate white clusters, and which are followed by a dry fruit that splits, at the onset of winter, to release narrow winged seeds so tiny and fine that they run to as many as 100,000 to the ounce. Joseph de Jussieu, the first European to set eyes on the cinchona, thirty years after Torti’s engraving of 1712, believed that Cinchona calisaya was the most beautiful tree he had ever seen.

For Torti and de Jussieu, intermittent fever or malaria was a disease of the Old World. No one knew for certain where it came from or what caused it. But everywhere the Old World expanded its boundaries – pushed ever on by commerce, religion and war – malaria followed. And the price it exacted was beyond imagining. ‘Malarial fever,’ wrote Sir Ronald Ross, the Englishman who in 1902 was awarded the Nobel Prize for Medicine for proving that malaria is transmitted by mosquitoes, ‘is important not only because of the misery it inflicts upon mankind, but also because of the serious opposition it has always given to the march of civilisation … No wild deserts, no savage races, no geographical difficulties have proved so inimical to civilisation as this disease.’

Within the foul-tasting, bitter red bark of the cinchona tree is an alkaloid that prevents and treats malaria. The Peruvian bark, which was first brought to Europe in 1631 or thereabouts, was looked upon as a miracle. But its discovery was also a riddle. Cinchona was a tree of the New World. It grew where the rain was plentiful in the foothills of the high Andes, where malaria had never existed. How did anyone guess that among all the trees in South America, it was the bark of the cinchona that would cure malaria? How was it that a seed so small it is almost invisible could grow into a tree, one eighteenth-century source wrote, that was as crucial to the art of medicine as gunpowder had been to the art of war?

This book is the story of the riddle of quinine, the miraculous fever-tree which transformed medicine – and history.