Any roughness was levelled by polishing with ivory or a smooth shell.
In the school of Wolgemut Diirer learned much, by his own account, but suffered not a little from the roughness of his companions.
In wind-fertilized plants the flowers are comparatively inconspicuous and devoid of much attraction for insects; and their pollen is smoother and smaller, and better adapted for transport by the wind, than that of insectfertilized plants, the roughness of which adapts it for attachment to the bodies of insects.
For a century the Appalachians were a barrier to the westward expansion of the English colonies; the continuity of the system, the bewildering multiplicity of its succeeding ridges, the tortuous courses and roughness of its transverse passes, a heavy forest and dense undergrowth all conspired to hold the settlers on the seaward-sloping plateaus and coastal plains.
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