ivas imported among timber used in re- 

 building the city of London after the 

 great fire in 1666. The bug is one of the 

 best subjects for exhibiting a micro- 

 scopic view of the circulation of the blood. 

 See BUG. 



CIMICIFUGA, in botany, a genus of 

 the Polyandria Tetragynia class and or- 

 der. Natural order of Multisiliquae. *Pa- 

 paveraceze, Jussieu. Essential character; 

 calyx four or five-leaved ; nectary four, 

 urceolate; capsule four to seven. There 

 is but one species ; viz. C. fcetida, a na- 

 tive of the distant parts of Siberia, flow- 

 ering in July, and ripening its seeds in 

 August. The whole plant has a strong 

 virose smell, occasioning the head-ach. 

 To this genus Pursh has referred Actea 

 Racemosa, or black snake-root; called 

 also rich- weed, cattle-weed, and squaroot. 

 It is one of the medicines of the Indians 

 of our country. 



CIMOLITE, in mineralogy, is of a 

 lu ht greyish white, inclining to pearl- 

 grey ; but by exposure to the air it ac- 

 quires a reddish tint. It occurs in mass, 

 forming large strata; its fracture is earthy, 

 uneven, and its texture more or less 

 slaty. It is opake, of a greasy lustre, 

 and may be scraped with a knife. It ad- 

 heres firmly to the tongue, stains the 

 fingers in some degree, and, though soft, 

 is very tough, and pulverized with diffi- 

 culty. The specific gravity 2.0. When 

 exposed to the action of the blow-pipe, 

 it becomes at first of a dark grey colour; 

 but afterwards recovers its whiteness 

 with little or no alteration : with borax it 

 forms a light brown glass. Its component 

 parts are, 



Silex . . . 

 Alumina . . 

 Oxide of iron 

 Water 



63.00 



23.00 



1.25 



12.00 



99.25 



It abounds in the island of Cimola, and 

 was in great request by the ancients for 

 its detergent properties ; at present its 

 use is almost entirely confined to the in- 

 habitants of the island. It produces the 

 same effects as fuller's earth, but in a 

 higher degree. 



CINCHONA, in botany, so named in 

 honour of the Countess del Cinchon, lady 

 of a Spanish viceroy, whose cure is said 

 first to have brought the Peruvian bark 

 into reputation, a genus of the Pentan- 



uria. Monogynia class and order. Natu 

 ral order of' Contorts:. Rubiacese, Jus 

 sieu. There are nine species. See BARK 



CINCHONIN, in chemistry: it has 

 been supposed that a principle, analogous 

 to animal gelatine, exists in some vegeta- 

 bles, particularly in the Peruvian bark : 

 this has been denominated cinchonin. In 

 this principle it has been supposed that 

 the febrifuge power of the bark resided, 

 and some have gone so far as to recom- 

 mend animal glue as a substitute for 

 bark. 



CINERARIA, in botany, a genus of 

 the Syngenesia Polygamia Superfluaclass 

 and order. Natural order of Composite 

 Discoidese. Corymbiferx, Jussieu. Es- 

 sential character ; calyx simple, many 

 leaved, equal ; pappus simple ; recepta- 

 cle naked. There are forty-one species, 

 most of them natives of the Cape of Good 

 Hope. 



CINNA, in botany, a genus of the Mo- 

 nandria Digynia class and order. Natural 

 order of grasses. Essential character : 

 calyx glume two-valved, one-flowered ; 

 corolla glume two-valved ; seed one. 

 There is but one species, -viz. C. arundi- 

 nacea, a native of Canada, and many part? 

 of the United States, 



CINNABAR, in mineralogy, a species 

 of the genus Mercury, of which there 

 are two sub-species, viz. the dark red, 

 and the bright red. The- former occurs 

 massive, disseminated, in blunt cornered 

 pieces, in membranes, amorphous,dendri- 

 tic, and fruticose ; it occurs also crystal- 

 lized. The specific gravity is from 7 to 

 10, and the constituent parts are 



Mercury 

 Sulphur 

 Iron 



81 

 15 



4 



100 



Before the blow-pipe it is completely 

 volatalized, giving a blue flame, and a 

 smoke which has the odour of sulphur. 

 Both species are found in Bohemia, Hun- 

 gary, Transylvania, and many other parts 

 of the continent ; but the most important 

 mercury mines are those of Almadin in 

 Spain, which have been worked upwards 

 of two thousand years. It is from this ore 

 that the greatest quantity of the mercury 

 of commerce is obtained. It is used also 

 as a pigment, but not by any means equal 

 to the artificial cinnabar. See the next 

 article. 



