GLA 



GLU 



stomach in birds, for the purpose of 



grinding their food with pebbles. It 

 answers the place of teeth. 



GLABROUS. Smooth. 



GLACIERS. Immense masses of 

 ice produced from the snow of mount- 

 ains occupying tiie valleys of Switzer- 

 land and countries equally elevated. 

 In geology, the study of glaciers is 

 peculiarly interesting; many are 10 

 to 15 miles long by two broad, and 

 from 300 to COO feet high. 



GLAND. In anatomy, organs 

 such as the liver, spleen, &c., which 

 consist of an immense development 

 of blood-vessels, and secrete a peculiar 

 fluid, as bile, urine, &c. They are 

 often microscopic, as the mucous 

 glands of the intestines, and Peyer's 

 glands. Sometimes they receive the 

 specific name of the secretion they 

 produce, as mucous glands, sebaceous 

 glands, lymphatic glands, &c. 



GLAND. In botany, small lumps 

 of vegetable matter near leaves, or 

 oval spots on the trunks of trees ; they 

 are unimportant except as a means 

 of recognising species. 



GLANDERS. See Horse. 



GLASS. That used for conserva- 

 tories should be of the greatest clear- 

 ness. Refuse glass, pounded fine, 

 has been used as a manure. The na- 

 ture of the substance differs with the 

 kind of glass, fm flint glass is a mix- 

 ture of sand, red-lead, and 14 per 

 cent, of potash. Crown, or window 

 glass, contains soda, with sand and 

 lime. The silicate of potash or soda 

 in these cases is very insoluble, and 

 the effect produced cannot be con- 

 siderable, unless a large dose is add- 

 ed. Pounded feldspar would form as 

 good a manure. The pounded refuse 

 is also used by glass-makers, and 

 called cullet. The finest powder is 

 used in making sand paper. Glass 

 may be converted into soluble sili- 

 cate of potash by fusion with its 

 weight of potash or soda in a cruci- 

 ble. 



GLASSWORT. The species of 

 Salicornia : they grow on salt plains, 

 and yield barilla by combustion. 



GLAUBER'S SALT. Sulphate of 

 soda. A saline purge used for horses 



326 



and cattle. The dose is one quarter 

 of a pound or more. 



GLAUCOLITE. A mineral, con- 

 taining 4^ per cent, potash, with sil- 

 ica, alumina, and 11 per cent. lime. 



GLAUCOMA (from yAav/cof, blue). 

 A disease of the eye, in which it be- 

 comes of a bluish colour. 



GLAUCOPIS (from ylavKOc, and 

 u^p, an eye). A genus of passerine 

 birds. Some of the species have 

 wattles at the root of the beak. 



GLAUCOUS. Sea-green, like the 

 cabbage-leaf, having a light, bluish 

 tint. 



GLEANING. Collecting the re- 

 fuse of the harvest. 



GLEBE. A tract of land belong- 

 ing to the Church. 



GLENOID (from yT^rjvr], a cavity). 

 The articular cavities of bones. 



GLIADINE. A name given by 

 Taddei to the portion of gluten solu- 

 ble in alcohol. Albumen. 



GLIRES. The Linnean name for 

 the Rodentia, from glis, a dormouse. 



GLOBULAR. Spherical. Globose, 

 resembling a sphere or globe. 



GLOBULINE. A rather indefinite 

 term used by botanists to describe 

 spherical particles in plants, whether 

 they be of colouring matter or starch. 

 In physiology, it is the white albu- 

 minous substance forming the interi- 

 or of the blood globules. 



GLOMERATE GLAND. Any 

 gland which discharges at once into 

 a duct without having any cavity. 



GLOMERULUS. A small capitu- 

 lum, usually axillary, an old name 

 for an inflorescence. When many 

 branches terminate by little flower 

 heads. 



GLOSSO (from y2.0Tra, the tongue). 

 A prefix to muscles, nerves, &c., at- 

 tached to the tongue. 



GLOTTIS. The upper opening of 

 the windpipe. It is protected with a 

 membrane called the epiglottis. 



GLUCINUM. The metallic base 

 of glucina, a rare earth, existing in 

 the beryl, emerald, and euclase. 



GLUCOSE. Grape sugar, starch 

 sugar, sugar of diabetes, of honey. It 

 is difticult to crystallize ; exists in 

 fruits, young stems ; is readily fer- 



