origin. Those contributions from Middle and South America are superior to other "The greatest service which can continents, for example from Africa be rendered to any country, (Briicher 1969, 1977). is to add a new useful plant If we compare Eurasia with the American to its culture." continent, we notice a fundamental differ Thomas Jefferson, 1743-1826, Third President of the USA ence as far as the origin of our cultivated plants and domestic animals is concerned. This book is the result of living and explor Whilst almost all useful animals have been ing over several decades in tropical...