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white swallowwort (Vincetoxicum officinale, a plant of the Asclepias family) as a bitter yellow amorphous substance; -- called also asclepiadin, and cynanchin.

A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid.

A yellow crystalline glucoside obtained from the pansy (Viola tricolor), and decomposing into glucose and quercitrin.

aceous plants, and the flowers of many of the species are blue, while others are white or yellow, or of several colors, as the pansy (Viola tricolor).

A pale yellow amorphous substance of alkaloidal nature and emetic properties, said to have been extracted from the root and foliage of the violet (Viola).

esignating, a complex nitroso derivative of barbituric acid. It is obtained as a white or yellow crystalline substance, and forms characteristic yellow, blue, and violet salts.

l composite herb (Scorzonera Hispanica) with narrow, entire leaves, and solitary heads of yellow flowers. The long, white, carrot-shaped roots are used for food in Spain and some other countries. Called also viper grass.

inchillas, but much larger. Its fur is soft and rather long, mottled gray above, white or yellowish white beneath. There is a white band across the muzzle, and a dark band on each cheek. It inhabits grassy plains, and is noted for its extensive burrows and for heaping up miscellaneous articles at the mouth of its burro…

aven. -- Direct vision (Opt.), vision when the image of the object falls directly on the yellow spot (see under Yellow); also, vision by means of rays which are not deviated from their original direction. -- Field of vision, field of view. See under Field. -- Indirect vision (Opt.), vision when the rays of light fro…

st animals. It is quickly bleached by light, passing through the colors, red, orange, and yellow, and then disappearing. Also called rhodopsin, and vision purple. See Optography. -- Visual ray, a line from the eye, or point of sight. -- Visual white (Physiol.), the final product in the action of light on visual purpl…

A mineral occurring in small six-sided tabular crystals of a green or yellow color. It is a hydrous vanadate of copper and lime.

An oxysulphide of lead occurring in implanted spherical globules of a yellowish or brownish color; -- called also voltzine.

The yellow fever in its worst form, when it is usually attended with black vomit. See Black vomit.

to, derived from, or designating, an acid obtained from a lichen (Cetraria vulpina) as a yellow or red crystalline substance which on decomposition yields pulvinic acid.

A fluophosphate of magnesia, occurring in yellowish crystals, and also in massive forms.

the hind claw longer and straighter, than do the water wagtails. Most of the species are yellow beneath. Called also yellow wagtail. -- Garden wagtail, the Indian black-breasted wagtail (Nemoricola Indica). -- Pied wagtail, the common European water wagtail (Motacilla lugubris). It is variegated with black and white…

izostedion vitreum) having large and prominent eyes; -- called also glasseye, pike perch, yellow pike, and wall-eyed perch.

cruciferous plant (Cheiranthus Cheiri), with sweet-scented flowers varying in color from yellow to orange and deep red. In Europe it very common on old walls.

Having yellow or red for a basis, or in their composition; -- said of colors, and opposed to cold which is of blue and its compounds.

s of the genus Vespa, which includes the true, or social, wasps, some of which are called yellow jackets.