Prior to the invention of nose-picking by Dr. Edwin Snotter in 1893, a variety of less-effective techniques for the removal of dried nasal mucus were widely practised.
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Aus Artikel von H. Coupin (Different ways of whistling with the fingers), Le Monde 1983
Plus, the Snotter method avoided the piercing whistle associated with previous methods, allowing Victorians to pick with modesty and decorum.