Nevertheless, I rested my hand a moment upon his head, and then glided it in a semi-professional manner along the line of dorsal elevation, until I came to a deep depression in his backbone, which corresponded exactly with the convexity of the bottle.

[convexities on skin] pimple, zit [Slang]; wen, wheel, papula [Med.], pustule, pock, proud flesh, growth, sarcoma, caruncle^, corn, wart, pappiloma, furuncle, polypus^, fungus, fungosity^, exostosis^, bleb, blister, blain^; boil &c (disease) 655; airbubble^, blob, papule, verruca.

Dawson Bobbs leaned against the wide brick entrance of the livery-stable, his red face balled into shining convexities by a quizzical smile.

Why difficulty should be chosen for its own sake, I am not able to discover; but it must not be forgotten, that, as the convexity is increased, the difficulty is lessened; and I know not well, whether this writer, who appears equally ambitious of difficulty, and studious of strength, will wish to increase the convexity for the gain of strength, or to lessen it for the love of difficulty.

Crevasses, caused by strains from variations in the rate of motion of different parts of the glacier and convexities in the channel, are mere cracks when they first open, so narrow as hardly to admit the blade of a pocket-knife, and gradually widen according to the extent of the strain and the depth of the glacier.