DIV SUPPLEMENT. DliU 



the innermost row of which maintains a con- DONK.EY ENGINE, a small engine em- 

 slant irritali >n of the eye. ployed to do work of minor power, iui'1 to 



DIVARICATE, diverging at an obtuie supply water to the boilers of larger engines, 

 angle. DORMITORY, a large sleeping apartment 



DOBERKINER'S LAMP, an invention, of with a number of beds. 



more importance before the manufacture of DORMOUSE, a genus of rodent mammals, 

 lucifer matches, by which an iustanta- of which the species 3fyoxu> avellauariut is 

 neous light, could be obtained by a jet of hy- the most known in England, 

 drogen brought in contact with apougy DOUBLE STARS, the popular name of 

 platina. those binary star systems now well known 



DOCIMASTIC ART, the department of me- to astronomy, in which it is found that one 

 tallurgy which determines the quantity of of the fixed stars, heretofore so called, when 

 metal in metallic ores and minerals by situated optically near another, is fre- 

 assaying. queutly also so related to it that the one is a 



DODECADACTYLUS, a somewhat arbitrary secondary to the other. Sirius, or the Dog 

 name given by the early anatomists to that Star, is so related to a larger but less brilliant 

 part of the small intestines now better primary, round which it performs an orbital 

 known as the duodenum. motion. There are many others, an>l there 



DODECAGON, an equilateral and equi- are also ternary and other systems, consist- 

 angular figure of twelve sides. The area of ing of three or more of the stais combined in 

 the dodecagon is exactly three fourths of the a system, and a great number of multiple 

 square of the diameter of the circle in which star systems in which many of these bodies 

 it may be inscribed. hold the same relation to each other as the 



DOGMA, a fundamental article of belief in bodies of the solar ystem. 

 dogmatic theology, usually applied to the DOUBLE-ACTING PUMP, a pump which 

 essential doctrines of Christianity, but more forces water by both the up and down 

 prominently used in recent times of those stroke, in consequence of the piston or 

 spurious pretensions of the Church of Rome plunger being solid, and there being two en- 

 to dominion over the faith of others, repu- trance and two exit valves, 

 dialed by St. Panl, 1 Cor. i. 24, and Gal. i.| DOVER'S POWDER, the pulris ipecacu 

 7, 8, 9, 11, 12, and especially to the dogma anhce compositut of the dispensatory ; a 

 of Papal infallibility. powder used as a successful sedative and sudo- 



DOG BOSK, the. Wild Brier or Rosa Ca- rific. The ordinary dose is ten gr.iins, con- 

 nina. sisting of one of ipecacuanha, one of opium, 



DOG- WOOD, a name given to various woods, and eight of sulphate ot potash, 

 and more especially to the shrubby Cornus DRACO MITIGATUS, the old name given to 

 of North America and Pigcidia erythrina of calomel by the alchemists, 

 the West Indies. The Bedjordia Salicina DRAGONNADES, the name given to the 

 of Tasmania is also known by this name. persecutions of the French Protestants in 



DOKIMASIA and EUTHYJJE, two examina- the reigns of Louis XIV. and Louis XV. 

 tions passed through by Athenian magis- DRAGONNEE, a heraldic animal, the lower 



trates, the first before entering upon office, 

 and the second on retiring from it. 



DOLCE, softly and sweetly ; an instructioi 

 in music. 



DOLICHOCEPHALIC, a term signifying 



half of which resembles a dragon, while the 

 upper resembles some other animal. 



DRAMATURGY, a German expression, from 



the Greek, employed to signify the principles 



iramatic representation and literature. 



ng-headed ;" an inaccurate term applied] DRASTIC MEDICINES, powerful and rapid 

 to heads or skulls, the transverse diameter purgatives, 

 of which to the longitudinal is less t an 8 toj DRIFT. See GLACIAL DRIFT. 

 10. This term was adopted by Professor DRIVING WHEELS, in locomotive engines, 

 Rebzius as expressing a peculiarity calcu- the wheels whose revolution is directly 

 lated to aid classification and establis : dis- caused by the engine. In ordinary machi- 

 tinction of race, as he found it in the West nery, the wheel which communicates motion 

 African Negro. It is, however, found that to another or to a series of wheels and 

 no classification can be based on mere pinions, 

 length and breadth of skulls. | DRCMMOND LIGHT, an intense luht pro- 



DOLOMITE, a general name of magnesian duced by passing a stream of o:^ - 

 lime stone, and a specific mineralogical through a flame of alcohol on a ballot quick 

 name for the rhombohedral carbonates of lime, 

 lime and magnesia. i DRUSES, a people indifferent to religious 



DOLPHIN, the Coryphama Hippurus of ceremonies, and said to be atheists, inhabit- 

 Linnaeus, celebrated by the poets for power- ing the mountains of Lebanon and as far 

 ful and rapid swimming, and the beautiful eastward as Baalbec. They are hospitable, 

 and brilliant colours it shows when dying, but revengeful when slightly provoked, and 

 The name is also given to the genus Delphis have been guilty of several massacres of the 

 of Linnseus, a well known cetaceous mam- Christians in Lebanon under the artful in- 

 mL See PORPOISE and CETACE^E. stigation of the Turks. 



786 



