(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.
Heroin itself is extracted from raw opium gum, which is produced solely from the opium poppy plant, even though there are a variety of other species of poppies that exist. The Oriental, California, and Flanders species of poppy are specific types of, poppy pod plants that are grown within North America.bout 60% of the entire world's opium is grown and cultivated in the remotest parts of Southeast Asia, especially in parts of Thailand, Burma, & Laos. Other primary opium poppy cultivation growers include Mexico, Pakistan, Afghanistan, Pakistan, & Colombia.