...The thickening is sometimes stationary; and theanimal dies without any further evil afflicting him... 
Dinks, Mayhew, and Hutchinson 「The Dog」
...This is an enlargement of the heart, and may consist of the thickening ofthe walls alone, or at the same time the cavities may be either enlarged ordiminished...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...As a result of inflammation extending from without inward, a gradualnarrowing of the milk duct may occur from thickening and narrowing of itslining membrane...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...In this form the duct of the teat is closed by the constriction of itslining membrane at one point, usually without thickening...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...In the whisper of the wind and the dead stillnessof the thickening gloom there was the sullen brewing of storm...
James Oliver Curwood 「Baree, Son of Kazan」
...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」
...By the time they had got safely over, twilight was fast thickening into darkness, and all but Congo were unwilling to proceed farther that night...
Mayne Reid 「The Giraffe Hunters」
...At the point where this comes into direct contact with the most curved part ofthe primary optic vesicle there is a thickening (l) and also adepression (o) of the horny plate (Fig...
Ernst Haeckel 「The Evolution of Man」
...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」
...We saw that thepalingenetic form of the heart is a spindle-shaped thickening of the gut-fibrelayer in the ventral wall of the head-gut...
Ernst Haeckel 「The Evolution of Man」
...Make a thickening of two tablespoons of flourcooked in two tablespoons of melted butter, and boil it in a pint ofmilk until thick...
Various 「Armour's Monthly Cook Book, Volume 2, No. 12, October 1913」
...The underbrush was thickening...
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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