(1834â1908), Dutch ophthalmologist. Snellen was director of an eye clinic at Utrecht. In 1862 he introduced a test for measuring the acuteness of vision which consisted of printed letters or words in type of various sizes.
The poppy of wartime remembrance is Papaver rhoeas, the red-flowered corn poppy. This poppy is a common weed in Europe and is found in many locations, including Flanders, which is the setting of the famous poem In Flanders Fields by the Canadian surgeon and soldier John McCrae.
Poppies are legal to grow in the United States, except for papaver somniferum. Among the many varieties of poppies, only opium poppy (Papaver somniferum) is illegal to grow in the United States.This native of Europe prefers the Mediterranean climates found in U.S. Department of Agriculture plant hardiness zones 8 to 10.t is illegal to grow Papaver somniferum in the United States because the unripe seed pods contain the milky substance that is scraped out and dried to become opium, so possession of the plant can be looked upon as possession of the drug.