...As I scanned the acres ofrough moor and then looked at the sea lapping delicately on the grey sand I hadthe feeling that a knotty problem was before me... 
John Buchan 「Mr. Standfast」
...There were about six hundred men seated respectfully on the ground around me, while I sat with my back to the huge knotty trunk, with Ibrahim and Richarn at a few paces distant...
Samuel White Baker 「In the Heart of Africa」
...“Berry bad, berry bad,” he answered, shaking his head, which he always did when he found a knotty point difficult to unravel...
W.H.G. Kingston 「The Two Supercargoes」
...Without harming the jointedor knotted covers, the contents, of equal volume and equally knotty,have slipped out as easily as though they were smooth, slippery objectssliding out of a loose sheath...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...Here, however, this variety presented the same knotty head,where other grasses grew luxuriantly...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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