...So the world was happy, and the face of the black-belt green and luxuriant with thickening flecks of the coming foam of the cotton... 
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...Antennæ short, cylindric, gradually thickening to their tip, which is naked and abruptly truncate...
William Swainson 「Zoological Illustrations, Volume I」
...The thickening is sometimes stationary; and theanimal dies without any further evil afflicting him...
Dinks, Mayhew, and Hutchinson 「The Dog」
...This condition consists in a chronic thickening of the skin, which mayaffect one or more limbs or involve the whole integument...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The great thickening of the walls of the artery and vein inthis disease is especially brought out by stating that in the healthy lung theyare so thin as to be easily overlooked...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The inflammatory edemaof the mouth extends to the mucous membrane of the trachea and bronchi,producing an extensive thickening and a yellowish infiltration...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...His work done,McTaggart hurried on through the thickening twilight of winter night tohis shack...
James Oliver Curwood 「Baree, Son of Kazan」
...Claustrum: the structure uniting the wings in flight,whether by hooks, by a thickening of the margin, or by ajugum...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Clavate: clubbed: thickening gradually toward thetip...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Ventral plate: a thickening of the blastoderm of an eggfrom which the embryo, but not the amnion or serosa isformed...
John. B. Smith 「Explanation of Terms Used in Entomology」
...There is nothing to prevent it from thickening the structure at willand adding as much material as it thinks proper to the innerscrapings from the shell...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...In the blur of storm or under clearskies, the span of daylight stretchesfarther from the fading dusk of dawn tothe thickening dusk of evening...
Rowland E. Robinson 「In New England Fields and Woods」
...'Well, but what must I do with all these little (hiccup) creatures?' askedSir Harry again, seeing the plot still thickening outside...
R. S. Surtees 「Mr. Sponge's Sporting Tour」
...At the back part of the head at both sides,near the after brain, a small thickening of the horny plate is formed at theupper end of the second gill-cleft (Fig...
Ernst Haeckel 「The Evolution of Man」
...Thebeetle-cloud was thickening...
Various 「Astounding Stories of Super-Science February 1930」
...Outside the mob was thickening, swarming through the grounds andscreeching like madmen...
Various 「Astounding Stories of Super-Science, October, 1930」
...Beyond was the open country,gradually thickening into scattered rows of crystal buildings...
Nat Schachner 「Slaves of Mercury」
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