The value of citrus fruit as a food and as a medicinal agent has been known for many centuries. There are Chinese and Japanese records available from as early as the seventeenth century which extol the medicinal value of citrus fruits. Their value as antiscorbutic agents has been known since the seventeenth century, and within recent years they have been found to be sources of vitamins A, B and C and of comparatively large quantities of calcium.
The orange is not a native of the United States. It was introduced by the Spaniards first into Florida and later into California. The Spaniards themselves obtained the fruit from the Portuguese, who had previously brought it from China. The first variety introduced into the United States ripened in December, January and February, but through intensive cultivation different varieties of oranges are now grown which ripen throughout practically all the year.
SCHWARTZ L. CUTANEOUS HAZARDS IN THE CITRUS FRUIT INDUSTRY: BRIEF HISTORY OF CITRUS FRUIT IN FLORIDA AND IN CALIFORNIA. Arch Derm Syphilol. 1938;37(4):631–649. doi:10.1001/archderm.1938.01480100084008
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