... The thews of the sire had beentransmitted to the son—it needed only the hardening of use to developthem... 
Edgar Rice Burroughs 「The Son of Tarzan」
...And with exposure came a toughening and hardening of his smooth, whiteskin, browning now beneath the sun and wind...
Edgar Rice Burroughs 「The Son of Tarzan」
...In the hardening process the silica was sometimessweated out of this rock, and it exists now as pretty efflorescences ofwell-shaped crystals...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...With all this came the strengthening and hardening of my own character...
W. E. B. Du Bois 「Darkwater」
...The definite outline of the chrysalisis soon taken on, the outer tissues hardening into adistinct covering...
Clarence M. Weed 「Butterflies Worth Knowing」
...A toy Schipperke is, so to speak, grown-up at ten oreleven months, but goes on thickening and improvingin shape, and probably increasing and hardening incoat for another year at least...
Mrs. Leslie Williams 「A Manual of Toy Dogs」
...Serific glands: are these which produce a thick,mucous-like secretion which, on hardening, forms silk...
John. B. Smith 「Explanation of Terms Used in Entomology」
...The hardening despotism of theimperial constitution, growing more and more autocratic every decade,also helped...
F. Haverfield 「Roman Britain in 1914」
...Its basewas held by the gummy, hardening rock...
Charles Willard Diffin 「Two Thousand Miles Below」
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