(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.
The Persian white poppy is the species of the Papaver somniferum opium plant from which poppy seeds and opium are extracted. The white poppy blooms between late spring and early autumn to produce white or near-white flowers. The plant contains the opiates narcotine, codeine, codamine, papaverine, narceine and thebaine.ts seeds are commonly used in cooking when baking muffins, cakes and bagels. The Central Intelligence Agency lists Papaver somniferum as an illicit drug. As of May 2010, growing Papaver somniferum opium plant is illegal in the United States. The opium poppy is extensively cultivated in China, India, Persia and Turkey.