When cool the rubber hardens and is readily handled. [Please select]
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[Illustration] This little case is at first a sticky substance that soon hardens. [Please select]
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It is used to saliva that hardens into silk. [Please select]
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Immediately after this tedious operation, its body is soft, but the crust soon hardens. [Please select]
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The skin is red and fretted, discharging an ichor which hardens into crusts. [Please select]
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This is the waiting-room in which the body hardens. [Please select]
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The body dries, the skin hardens, the wings expand, and in a few moments, sometimes an hour, the butterfly (Fig.) [Please select]
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The fluids leave the surface, the crust hardens and dries, rich and varied tints appear, and our Dragon fly rises into its new world of light and sunshine a gorgeous, but repulsive being. [Please select]
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