..."I might just as wellnot establish an out-post if a man can filter through whenever hepleases... 
Edgar Rice Burroughs 「Tarzan the Untamed」
...Before boiling the water youcan carefully filter it if you like...
Mary H. Kingsley 「Travels in West Africa」
...A good filter is a very finething for clearing drinking water of hippopotami, crocodiles, watersnakes, catfish, etc...
Mary H. Kingsley 「Travels in West Africa」
...The dust seemed to filter in just the same, and infive minutes the house was an inch thick in it...
Various 「Argentina From A British Point Of View」
...With chromium, uranium, lead,platinum, and copper, it gives a dark red; that from the last metalturning brown when collected on a filter...
George Field 「Field's Chromatography」
...The clouds act as a screenand filter out actinic rays...
Various 「Astounding Stories of Super-Science, December 1930」
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