TER 



TET 



the inferior, unripe, and brittle kinds 

 scrubs. The sorts arc j)ut into open 

 bales of sticks for sale. 9000 heads 

 of the first form a pack, and 20,000 

 of the second. An acre will yield ten 

 to fifteen packs in all. The haulm is 

 burned on tiie ground. The crop is 

 not exhausting, but sometimes fails. 



TECTRICES. The small feathers 

 which cover the quill feathers. 



TEDDING HAY. Spreading it out. 



T E E T H. To leara the age of 

 horses by, see Horse. 



TEGMENTA. The scales of win- 

 ter liuds. 



TEGUMENT, or TEGMEN. Tn 

 anatomy, the general covering of the 

 body. In entomology the term is ap- 

 plied to the coverings of the wings 

 of the order Orthoptera, or straight- 

 winged insects. 



TEMPORAL BONES. Tlie tem- 

 ple bones. 



TENACITY. Cohesion. The 

 power of resisting a pulling force. 



TENACULUM. A simple small 

 hook, used to seize bleeding vessels 

 in operations. 



TENDRIL. A clasping stem, as 

 that of the vine. 



TENESMUS. A straining and in- 

 effectual effort to relieve t!ie bowels ; 

 it is a symptom of irritations and in- 

 flammations of the bowels. 



TENON. The end of a rail intro-' 

 duced into a mortice. 



TENSOR MUSCLES. Those 

 which tighten a part. 



TENT. A plug of lint or sponge 

 introduced into wounds to dilate 

 them, or to stop hemorrhages. 



TENTACULA, or TENTACLES. 

 Prehensile, thread-like organs in the 

 lower animals, usually arranged 

 aro>md their mouths. 



T E N U I R O S T E R S. Incesso- 

 rial birds, with a slender bill. 



TEREBIIANTIA. A section of 

 hymenopterous insects, the females 

 of which are furnished with a tercbra, 

 or borer, with which she bores into 

 the bark of trees, or the bodies of an- 

 imals, to deposiie her eggs. The ich- 

 neumons, wheat insect, &.C., are of 

 this class. See Insects. 



TERETE (from teres, round). A 

 790 



term applied to round stems, anten- 

 na;, &,c. 



TERGUM. In insects, the upper 

 part of the abdomen or back. 



TER.MITES. A genus of insects 

 inhabiting tropical Africa and Amer- 

 ica, and allied to the ants. 



TERRACE. A raised bank, for a 

 promenade and ornamental objects. 



T E R T I A R Y F O R M A T ION. 

 Strata situated above the chalk and 

 green sand, disposed in basins, and 

 for the most part sedimentary, but 

 containing some hard rocks. It is di- 

 vided into three portions, the eocine, 

 miocine. and pliocine, which see. 



TESSELATED. Marked into 

 squares, or trapezoids ; a pavement 

 laid with square stones of different 

 colours. 



TEST. In chemistry, anything by 

 which we distinguish the chemical 

 nature of substances from each oth- 

 er ; thus, infusion of galls is a test of 

 the presence of iron, which it ren- 

 ders evident by the production of a 

 black colour in water and other li- 

 quids containing that metal ; in the 

 same way, sulphuretted hydrogen is a 

 test of the presence of lead, and ni- 

 trate of baryta, of sulphuric acid. In 

 metallurgy and assaymg, the porous 

 crucible which absorbs the liquid vit- 

 rifiable oxide of lead and other met- 

 als combined with it is sometimes 

 called the lest. 



TESTA. The shell or integument 

 of a seed. 



TESTACEANS. Animals provi- 

 ded with a shell. 



TESTES. The glands which pro- 

 duce the reproductive secretion of 

 male animals. 



TESTUDINATA. A tribe of an- 

 imals like the tortoise, furnished with 

 a carapace or horny covering. 



TETANUS. Locked jaw. 



TETHERING. Fastening cattle 

 or horses by a rope, or chain, to a 

 post, or tree, to give them a limited 

 pasturage. 



TETRADYNAMIA. Having four 

 long and two short stamens, as the 

 cruciferous plants. 



TETRAGONA. The New Zea- 

 land spinach. See Spinach. 



