... 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」
...With all this came the strengthening and hardening of my own character...
W. E. B. Du Bois 「Darkwater」
...Their existence can generally be discovered by asmall portion of mucus, which, hardening, is found adheringto the anus...
Richard L. Allen 「Domestic Animals」
...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」
...The walls of the gallery are rough, but the cells are linedwith a mucous-like secretion, which, on hardening, looks like theglazing of earthenware...
Alpheus Spring Packard 「Our Common Insects」
... In the meantime, however, the desperate one is hardening her skin; she spreads wide the sail of her wings and dons her deep mourning of black and darkest blue...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...The starfish, or "five fingers," will, after washing, drywell, or can be plunged in any one of the hardening solutionsmentioned in Chapter IV...
Montagu Browne 「Practical Taxidermy」
...No more will the sportsman's honest hunger be appeased bythe brook trout's fine-grained flesh from hardening waters of nearbymountain brooks...
Charles Bradford 「The Determined Angler and the Brook Trout」
...The hardening despotism of theimperial constitution, growing more and more autocratic every decade,also helped...
F. Haverfield 「Roman Britain in 1914」
...And upon this torn, hardening surface,with the cooling fires receding to the inner core, I knew that thegreat envelope of steam had cooled and condensed...
Various 「Astounding Stories, May, 1931」
...Its basewas held by the gummy, hardening rock...
Charles Willard Diffin 「Two Thousand Miles Below」
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