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erous flies of the genus Syrphus and allied genera. They are usually bright-colored, with yellow bands, and hover around plants. The larvæ feed upon plant lice, and are, therefore, very beneficial to agriculture.

A hydrous chloride of calcium and magnesium occurring in yellowish masses which rapidly deliquesce upon exposure. It is found in the salt mines at Stassfurt.

n Indian species are O. longicauda, which has the back, scapulars, and upper tail coverts yellowish green, and the under parts white; and the golden-headed tailor bird (O. coronatus), which has the top of the head golden yellow and the back and wings pale olive-green.

A yellowish-brown color, like that of tan.

bling, tan; as, tannic acid. Tannic acid. (Chem.) (a) An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid.

A compound obtained as a yellowish gray powder by the action of acetyl chloride or acetic anhydride or ordinary tannic acid. It is used as an intestinal astringent, and locally in rhinitis and pharyngitis.

An artificial dyestuff obtained as an orange-yellow powder, and regarded as a phenyl hydrazine derivative of tartaric and sulphonic acids.

maize field grew and ripened, Till it stood in all the splendor Of its garments green and yellow, Of its tassels and its plumage. Longfellow.

Of a dull yellowish brown color, like things tanned, or persons who are sunburnt; as, tawny Moor or Spaniard; the tawny lion. "A leopard's tawny and spotted hide." Longfellow.

(Tejus teguexin). It becomes three or four feet long, and is blackish above, marked with yellowish spots of various sizes. It feeds upon fruits, insects, reptiles, young birds, and birds' eggs. The closely allied species Tejus rufescens is called red teguexin.

Oxide of tellurium. It occurs sparingly in tufts of white or yellowish crystals.

the shade of color that indicates the degree of temper in tempering steel, as pale straw yellow for lancets, razors, and tools for metal; dark straw yellow for penknives, screw taps, etc.; brown yellow for axes, chisels, and plane irons; yellow tinged with purple for table knives and shears; purple for swords and watc…

A small yellow singing bird, with an ash-colored head; the European siskin. Called also tarin.

Having a dull red brick color or a brownish yellow color. Testaceous animals (Zoöl.), animals having a firm, calcareous shell, as oysters and clams, thus distinguished from crustaceous animals, whose shells are more thin and soft, and consist of several joints, or articulations, as lobsters and crabs.…

A hydrocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

taurea. -- Torch thistle, a candelabra-shaped plant of the genus Cereus. See Cereus. -- Yellow thistle, Cincus horridulus. Thistle bird (Zoöl.), the American goldfinch, or yellow-bird (Spinus tristis); -- so called on account of its feeding on the seeds of thistles. See Illust. under Goldfinch. -- Thistle butterfly…

A mineral of a brown to black color, or, as in the variety orangite, orange-yellow. It is essentially a silicate of thorium.

ting, or pert. to, a photomechanical process employing printings in three colors, as red, yellow, and blue.

s singing bird (Pachycephala gutturalis). The male is conspicuously marked with black and yellow, and has a black crescent on the breast. Called also white-throated thickhead, orange-breasted thrust, black-crowned thrush, guttural thrush, and black-breasted flycatcher.

A California composite plant (Layia platyglossa), the flower of which has yellow rays tipped with white.