...You can harden 'em up after... 
Rudyard Kipling 「"Captains Courageous"」
...This is intended to harden the young soldiers, and prepare them for the rank of men...
David Livingstone 「Missionary Travels and Researches in South Africa」
...These tubes were formed by plastering a mixture ofclay and grass round a smooth roller of wood, which, as soon asthe clay began to harden, was withdrawn, and the tube left to dryin the sun...
Mungo Park 「Travels in the Interior of Africa, Vol. 2 [of 2]」
... Dinah was the mother of thirteen children, all of whom bad been taken from her when young; and this, no doubt, did much to harden her feelings, and make her hate all white persons...
William Wells Brown 「Clotelle」
...A warm skin stretchedon the curly buffalo-grass, hair side down, sticks to the ground ofitself until it has ample time to harden...
William T. Hornaday 「The Extermination of the American Bison」
...Thehunters, to counteract this, are accustomed to harden the ball, bythe introduction of a small portion of type-metal along with thelead...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...Heat and aprolonged air-bath are necessary to harden and colour the fragilecreature...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...Thematerial of the nest is in fact a substance similar to silk, but insteadof being drawn into a thread it is allowed to harden while a mass ofspongy foam...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...The skin has had time to harden into a shell; but it was too late, the tissues being already infected...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...Its wings stretch out and harden...
Margaret Warner Morley 「The Insect Folk」
... is wicked enough to harden hearts...
Jean Meslier Anna Knoop 「Superstition In All Ages (1732)」
...What fat there was on the inside was very yellow, and so soft itwould not harden at all...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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