...The largest of the Scoters, length 22 inches,distinguished by a large white speculum on thewing, also a white comet extending from underthe eye backwards... 
Chester A. Reed 「The Bird Book」
...Head and throat as in ♂, back fuscousand buffy; breast and sides ochraceous thickly spottedwith blackish; speculum ashy gray and white...
Frank M. Chapman 「Color Key to North American Birds」
...Head and throatrusty, finely streaked and barred with black; breast andsides rusty; speculum blackish...
Frank M. Chapman 「Color Key to North American Birds」
...Head andthroat brown; breast and back gray, a white throat-ring;belly and speculum white...
Frank M. Chapman 「Color Key to North American Birds」
...A whitish patchon either side of head; throat and upper parts grayishbrown; belly and speculum white...
Frank M. Chapman 「Color Key to North American Birds」
...Such enlarged glands may bedifferentiated from tumors by passing the hand into the cow's throat after thejaws are separated by a suitable speculum or gag...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Color—Male—Head and neck, green; breast, white,shading into rusty chestnut toward the abdomen; lesserwing-coverts, blue; speculum, green, with white border;legs, orange red...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...The general color isbuff, mottled with brown; wing-coverts and speculum,same as the male...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Color—Male—Head and neck, black, showing a greenluster in the sun; back, gray, finely lined with black;under parts, white; speculum, white...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Head and upper parts, adark, dead brown; under parts, white; speculum, white;a small, elongated white spot on the side of the head...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...These wereilluminated by a speculum, near the object-glass, reflecting the light from alantern placed over the axis, the upper part of the telescope-tube being partlycut away to admit the light...
George Forbes 「History of Astronomy」
...Company is not always pleasing, and I would much rather be polishing a speculum...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Furnaces for the speculum metal were built, standserected, and the 40-foot telescope fairly begun...
Oliver Lodge 「Pioneers of Science」
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