...Protracted concentration upon the subject was giving him an extraordinary penetration of vision... 
Rafael Sabatini 「Scaramouche」
...The veil of color and race still hung thickly between her and her pupils; and yet she seemed to see some points of penetration...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
... "We must all learn," she replied with penetration, and so their friendship was established...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...In its forested habitat there is not sufficient loweringof the temperature nor sufficient penetration of strong winds...
Francis Harper 「The Barren Ground Caribou of Keewatin」
..." He visioneddimly some denizen of the vast depths, living beyond the limits of thesun's penetration, far in the abysmal darkness where its only lightmust be self-made...
Various 「Astounding Stories of Super-Science, June, 1930」
...However, this capacityof absorption has definite limits in each variety of plasm; living plasmis not soluble in water, but absolutely resists the penetration of anywater beyond this limit...
E. Walter Maunder 「Are the Planets Inhabited?」
...A lively curiosity, a spirit of emulation,the desire of not being outdone, had the privilegeof giving to the natural vision an unusual powerof penetration...
George Chambers 「The Story of Eclipses」
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