Chambers's encyclopædia; a dictionary of universal knowledge . ngland, where the subsoil containing itin great quantity has been rashly brought up bythe plough.—G., deprived of its water by burning,and reduced to powder, forms a paste whichalmost immediately sets, or becomes firm and solid,when mixed with its own bulk of water ; hence thegreat use of Plaster of Paris for making casts andcornices. But if the G. is burned at too great aheat, it refuses to set, and the powder of the mineralcalled A nhydrlte, which is an anhydrous sulphate oflime, has not the property of setting.—One of thefinest
Chambers's encyclopædia; a dictionary of universal knowledge . ngland, where the subsoil containing itin great quantity has been rashly brought up bythe plough.—G., deprived of its water by burning,and reduced to powder, forms a paste whichalmost immediately sets, or becomes firm and solid,when mixed with its own bulk of water ; hence thegreat use of Plaster of Paris for making casts andcornices. But if the G. is burned at too great aheat, it refuses to set, and the powder of the mineralcalled A nhydrlte, which is an anhydrous sulphate oflime, has not the property of setting.—One of thefinest varieties of uncrystallised and imtransparentG. is Alabaster (q. v.).—Satin Spar is a beautifulfibrous variety of G., exhibiting a fine play of light,and emjdoyed for necklaces, inlaid-Mork, and otherornamental purposes, but having the disadvantageof being easily scratched. GYRATION, Centre of. See Centre ofGyration. GYR-FALCON, or JER-FALCON {Falco gar-falco or F. Islandicus), a species of Falcon (q. v.)of largo size, the female, which is the largest,. GjT-falcon {Falco Islandicus). beinrr about two feet in entire length ; the plumagoalmost brown when the bird is young, but gradu-ally changing to white as it advances in age, thewhite margui of each feather encroaching on its 173 GYELNTJS—GYULA. brown centre, until aged birds are almost pure is rarely seen in Britain, and very rarely inthe southern parts of the island, but inhabits allthe very cold northern parts of the -world. It wasformerly in high esteem for falconrj-, and was pro-cured at (ncat expense from Iceland and is sometimes called Icela^D , and some-times Greexlaxd Falcon. GYRIXUS, a Linnaean genus of coleopterousinsects, now constitiitins a family, Gifrinidce, closelyallied to Dytiscidce, or Water Beetles (see Dytlscus),but differing in ha\ing the antennas very short,the two fore-legs long and stretching forward like
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