(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.
CULTIVATION Commercial trial crops of opium poppies were first grown in England in 2002. Alkaloids are natural organic nitrogen-containing bases found mainly in plants. Morphine, a bitter white crystalline compound, is the principal alkaloid in the opium poppy Papaver somniferum. Traces of the compound, possibly from dietary sources, also occur in animal tissues and fluids, including human heart tissue and urine.