It's become a party cliche to comment on our need for the results of combining a poisonous gas [chlorine] and a volatile metal [sodium]. Kurlansky passes quickly over such levity to seriously relate the role of sodium chloride in human society. While at first glance his account may seem overdone, a bit of reflection reveals that something so common in our lives is easily overlooked. Salt is essential to our existence. Our need is so strong and enduring that we tend to take its availability for granted. As a global history, this book is an ambitious attempt to re-introduce us to something we think common and uninteresting. It's immensely successful through Kurlansky's multi-faceted approach. He combines economics, politics, culinary practices, tradition and myth in making his presentation. About the only aspect ignored is the detailed biological one explaining why this compound is so necessary to our existence.
Because our need for salt is so fundamental, its history encompasses that of humanity. Salt was basic to many economies, Kurlansky notes. It's acted as the basis of exchange between traders, was the target of empire builders and even paid out to soldiers as a form of "salary" - hence the term. Venice, a coastal city tucked away from the main tracks of Mediterranean trade, bloomed into prominence when it discovered it could garner more profit by trading in salt than by manufacturing it. The Venetian empire and later renaissance was founded on the salt trade.
Empires may be built on salt, but can be felled by misguided policies on its trade and consumption. One element leading to the downfall of the French monarchy was the hated "gabelle", or salt tax, which imposed a heavier burden on farming peasants than it did on the aristocracy. The reputation of tax evasion borne by the French relates to the resentment expressed over the salt tax. A British regulation on salt resulted in similar reaction leading to the breakup up their own Empire. It was a "march to the sea" led by Mahatma Ghandi to collect salt that galvanised resistance to British rule. Over a century after the French Revolution, the British were displaced from India for similar reasons - greed.
While acknowledging the importance of salt in our lives, Kurlansky notes that determining how much is "too little" or "too much" is elusive. Many people today claim to have "salt-free" diets while remaining ignorant of how much salt is contained in our foods, both naturally and through processing. Yet, as Kurlansky records, salt has appeal beyond just the body's needs. He records numerous commentators from ancient Egypt, China and Rome who express their admiration for salt's flavour-adding qualities. Sauces based on various ingredients mixed with salt permeate the book. He notes that the salt dispenser is a modern innovation, supplementing the use of salt in cooking processes.
Salt's decline in conserving food, which changed the amount of salt we consume directly, came about due to increased world trade, displacement of rural populations into cities, and, of course, war. "The first blow" displacing salt as a preservative came from a Parisian cook; a man so obscure that his given name remains disputed. Nicolas [Francois?] Appert worked out how to preserve meat by "canning". Adopted by Napoleon's armies, the technique spread rapidly. The technology of the Industrial Revolution led to effective refrigeration. Kurlansky gives an account of Clarence Birdseye's efforts to found what became a major industry.
Although the topic seems overspecialised, the universal application and long historical view of this book establishes its importance. Kurlansky has successfully met an immense challenge in presenting a wealth of information. That he graces what might have been a dry pedantic exercise with recipes, anecdotes, photographs and maps grants this book wide appeal. He's to be congratulated for his worldly view and comprehensive presentation.