...It appearedto be thinning... 
George Murray Levick 「Antarctic Penguins」
...With the thinning out of the forest the creek grew more shallow...
James Oliver Curwood 「Baree, Son of Kazan」
...An almost continuouscanopy of foliage has developed, shading the understory and thinning itby killing shrubs and saplings...
Henry S. Fitch 「Ecological Observations on the Woodrat, Neotoma floridana」
...They have another object besides the sport—that of thinning off the squirrels for the protection of the planter’s corn-field...
Mayne Reid 「The Hunters' Feast」
...Each position of the brush conformsto a specific quality of the line, either sharp and precise or broad andquivering, the ink spreading in strong touches or thinning to delicateshades...
Raphael Petrucci Frances Seaver 「Chinese Painters」
...It was perhaps half an hour after we had passed the circular city when, far ahead, I could see the pale, unhealthy forest thinning out...
Various 「Astounding Stories of Super-Science January 1931」
...Thecrowd was thinning out around us...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...Behind it lay a thinning sheet of vapor—thick white mist which seemed to rise and move more swiftly to overtake the main body...
William Fitzgerald Jenkins 「The Fifth-Dimension Tube」
...They bit into the fast thinning air with a muffled whine,raised the ship by feet that should have been yards...
Arthur Leo Zagat 「The Great Dome on Mercury」
...I steered south-east, and we came out of the scrubs, whichhad been thinning, on to the great plain, in forty-nine or fifty miles...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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