Malus niedzwetzkyana Tajikistan borders, it is known as 'kisil alma': 'red apple'. "Malus niedzwetzkyana" has been used to breed some modern red-leaved, red-flowered, and red-fruited apples and crabapples. It is believed to be the ancestor of Surprise, a pink-fleshed apple that was brought to the United States by German immigrants around 1840 and was later used by the horticulturist Albert Etter to breed some 30 pink- and red-fleshed varieties, the best-known of which is Pink Pearl. Another horticulturist, Niels Ebbesen Hansen, encountered "M. niedzwetzkyana" in the Ili valley, where he also met Niedzwetzky, in what was then the Russian region of Turkestan
Étienne-Louis Malus index between the surface and the interior of the glass). It was not until 1815 that Sir David Brewster was able to experiment with higher quality glasses and correctly formulate what is known as Brewster's law. This law was later explained theoretically by Augustin Fresnel, as a special case of his Fresnel equations. Malus is probably best remembered for Malus's law, giving the resultant intensity, when a polariser is placed in the path of an incident beam. His name is one of the 72 names inscribed on the Eiffel tower. Étienne-Louis Malus Étienne-Louis Malus (; ; 23 July 1775 –