These 12 listings are so strange that each appears in only one of the 7 encyclopedias we compared. They include such classics as Tetragraptus, Tetragynia, Tetrahedrite.
in palæontology, a genus of Graptolitidæ from the Skiddaw and Quebec groups (Lower Silurian). four simple The polypary consists mono-prionidian branches, springing from central non-celluliferous connecting a process, which bifurcates at each end. The celluliferous branches do not subdivide, and the base may be enveloped horny disk. in a peculiar
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an order of plants in Linnæus' artificial system. It consisted of plants having four pistils. The classes Tetrandria, Pentandria, Hexandria, Heptandria, Octandria, and Polyandria, have each an order Tetragynia.
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a name given to a group of minerals having considerable diversity in composition, but presenting the same general general formula. Named from the prevailing tetrahedral habit of its crystals. Crystallization isometric, frequently twinned; luster, metallic; ic; color and streak, steel-gray to iron-black; opaque; fracture, sub-conchoidal, uneven; brittle. Composition, essentially a sulphantimonite of copper, with the formula 4CuS-+Sb2S3; but in consequence of part of the copper being frequently replaced by iron, zinc, silver, mercury, and occasionally cobalt, and part of the antimony by arsenic or bismuth, the general formula is usually written as 4(Cu, Fe, Zn, Ag, Hg)+(Sb, As, Bi) 2S3. Dana divides tetrahedrites as follows: (1) An antimonial series. (2) An arsenio-antimonial series. (3) A bismuthic-arsenioantimonial and an arsenical series, in which the antimony is entirely replaced by arsenic. The varieties are: (1) Ordi nary, containing very little or no silver. (2) Argentiferous = freibergite. (3) schwatzite, spaniolite Mercuriferous = , and hermesite. (4) Platiniferous. Fieldite, aphthonite and polytelite are subspecies. An abundant ore in many parts of the world, sometimes, where rich in silver, mined for that metal only.
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or TETRAE- DRON, in geometry, a polyhedron bounded by four triangles. If the middle points of the faces be properly joined, two and two, the lines joining them are the edges of a second tetrahedron. A regular tetrahedron is one in which the faces are equal and equilateral triangles. If the middle points of the faces be joined two and two, the lines joining them form the edges of a regular tetrahedron. All regular tetrahedrons are similar solids.
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in Greek drama, the name given to a collection of four' dramatic compositions—a trilogy and a satyric piece-exhibited together on the Athenian stage for the prize given at the festival of Bacchus. The expression tetralogy is sometimes applied by modern authors to a series of four connected plays.
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in zoölogy, in Latreille's classification, a section of the Coleoptera. They are distinguished by the atrophy of the fourth tarsal joint in all the feet, so that they have only four freely articulating joints. The atrophied joint is generally extremely minute, and concealed in the deep notch of the third joint, which, in the majority of the species, is bilobed and clothed beneath with a brush of minute hairs. The section includes more than a third of the whole order, and all the species are vegetable feeders.
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a typical sub-family of the Tetraonidæ, chiefly from the N. parts of the Palearctic and Nearctic regions, with the following genera: Tetrao, Bonasa, Centrocercus, Dendragopus, Canace, Falcipennis, Pediocætes, Cupidonia, and Lagopus. They are rather large in size, heavy in body, with small heads, the nasal fosse filled with feathers concealing the nostrils; neck moderately long; wings short, rounded, and concave beneath; stout legs and feet; toes with pectinations of scales along the edges, hind toe elevated above the plane of the rest; tarsi covered with feathers, in Bonasa partially, in Lagopus, to the claws.
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in zoology, an Asiatic genus of Emydæ, having hav five toes, but one on each foot without a nail. Twentyfive marginal scales. Species, T. lessonii and T. baska.
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in zoology, an Asiatic genus of Emydæ, having five toes, but one on each foot without a nail. Twentyfive marginal scales. Species, T. lessonii and T. baska.
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in ornithology, the Ceuta. the Lophophorus obscurus; often made a ed with the oranges separate genus of the sub - family Lopho- grapes to any in the phorinæ, connecting the Phasianinæ with reckoned Spanish government, Tetraogallus, and so with the Perdicinæ. world. This bird was discovered by Pére David having in Tibet and described by him. General against color brown, marked with darker shades; bare skin of face red, tarsi and feet horncolor. The sexes are alike in plumage; female destitute of spurs. contact of the earth with any kind of wound, especially wounds in the hands or feet, which is the most important factor in the development of tetanus. No certain remedy for tetanus has as yet been discovered though antitetanic serum has been successfully used as a preventive. A very simple preventive of lockjaw is here given. As soon as possible after the wound is received hold the part affected for 20 minutes in the smoke of woolen or flannel. This is easily procured by placing butts or pieces of woolen or flannel cloth on a shovelful of hot
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in ornithology, the Lophophorus obscurus; often made a separate genus of the sub-family Lophophorinæ, connecting the Phasianinæ with Tetraogallus, and so with the Perdicinæ. This bird was discovered by Pére David in Tibet and described by him. General color brown, marked with darker shades; bare skin of face red, tarsi and feet horncolor. The sexes are alike in plumage; female destitute of spurs. TETRARCH ("governor of the fourth part," i. e., of a country), a title originally designating what is signified by its etymology, the governor of one of four divisions of a kingdom or country; but in the usage of the later Roman empire given undistinguishingly to all minor rulers, especially lly in the E., possessing sovereign right within their territory, but dependent on the emperor, and in many cases removable at his pleasure. This was especially the case in Syria, where the princes of the family of Herod are called indiscriminately by this title (Luke iii: 1) and by that of king (Matt. xiv: 9).
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in architecture, having or consisting of four columns; having a portico consisting of four columns; as the Temple of Fortuna Virilis at Rome; a portico, etc., consisting of four columns. A cavædium was called tetrastyle when the beams of the compluvium were supported by columns placed over against the four angles of a court.
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