dried, ground to a fine powder, and mixed into a liquid (commonly wine) in order to be drunk. Large-scale use of quinine as a malaria prophylaxis started around 1850. In 1853 Paul Briquet published a brief history and discussion of the literature on "quinquina". Quinine played a significant role in the colonization of Africa by Europeans. The availability of quinine for treatment had been said to be the prime reason Africa ceased to be known as the "white man's grave". A historian said, "it was quinine's efficacy that gave colonists fresh opportunities to swarm into the Gold Coast, Nigeria and other parts of west Africa". To maintain their monopoly on cinchona bark, Peru and surrounding countries began outlawing the export of cinchona seeds and saplings in the early 19th century. In 1865, Manuel Incra Mamani collected seeds from a plant particularly high in quinine and provided them to Charles Ledger. Ledger sent them to his brother, who sold them to the Dutch government. Mamani was arrested on a seed collecting trip in 1871, and beaten so severely, likely because of providing the seeds to foreigners, that he died soon afterwards. By the late 19th century the Dutch grew the plants in Indonesian plantations. Soon they became the main suppliers of the tree. In 1913 they set up the Kina Bureau, a cartel of cinchona producers charged with controlling price and production. By the 1930s Dutch plantations in Java were producing 22 million pounds of cinchona bark, or 97% of the world's quinine production. U.S. attempts to prosecute the Kina Bureau proved unsuccessful. During World War II, Allied powers were cut off from their supply of quinine when Germany conquered the Netherlands, and Japan controlled the Philippines and Indonesia. The US had obtained four million cinchona seeds from the Philippines and began operating cinchona plantations in Costa Rica. Additionally, they began harvesting wild cinchona bark during the Cinchona Missions. Such supplies came too late. Tens of thousands of US troops in Africa and the South Pacific died of malaria due to the lack of quinine. Despite controlling the supply, the Japanese did not make effective use of quinine, and thousands of Japanese troops in the southwest Pacific died as a result. Quinine remained the antimalarial drug of choice until after World War II. Since then, other drugs that have fewer side effects, such as chloroquine, have largely replaced it. Bromo Quinine