NASUA 



NECROPHAGA 



email yellow flower, belonging to Brassi- 



Nasua, (na'su-a). [L. nasus, nose.]=Coati: 

 a small bear-like animal, belonging to Car- 

 nivora. 



Natatores, (na-ta-to'rez). [L. nato, I swim.] 

 Swimming-birds: aquatic, polygamous birds, 

 with short legs, webbed toes, and thick 

 feathers; ducks, geese, gulls, &c.; classified 

 as Brevipennatse, Longipennatae, and La- 

 mellirostres. 

 Native, N. /)iagrnesia=Brucite. N. mercury 



^Quicksilver. 



Native minerals, uncombined with other 

 substances. 



Gold group- 

 Gold. 

 Silver. 



Iron group 

 Platinum. 

 Quicksilver. 

 Lead. 

 Zinc. 



Mercury, &c. 

 Tin. 



Arsenic group- 

 Arsenic. 

 Antimony. 

 Bismuth. 

 Sulphur group- 

 Sulphur. 

 Tellurium. 

 Carbon group 

 Carbon. 

 Diamond, &p. 



Natrix, (na'triks). [L. natrix, water-snake.] 

 A snake belonging to Colubridae. N. tor- 

 quata=Common snake^Coluber natrix. 

 Natrium, (na'tri-um). [The Latin name.]= 



Sodium, q.v. 



Natrocalcite, (na-tro-kal'sit). [Natron and 

 Calcite, q.v.] A mineral, chiefly carbonate 

 of calcium, named from being supposed to 

 contain soda. 



Natrolite, ( na'tro-Kt ). [Natron, q.v. ; Gk. 

 lithos, stone.] l.=Mesotype: a mineral of the 

 zeolite group; a silicate of aluminum and 

 sodium, found in veins of basalt and trachyte 

 rocks, v. Fusibility. 2. Ekebergite. 

 Natron, (na'tron). [Natrum, the Latin word.] 

 A white mineral, chiefly carbonate of sodium. 

 N. aZm=Mendozite. N. saltpetre=Soda.- 

 nitre. 



Natural, (nat'u-ral). [Nature, q.v.] N. bases: 

 naturally formed substances having the 

 properties of bases. N. classification of plants 

 and animals: v. Botanical systems and Zo- 

 ology. N. fats, v. Fats. N. maffnet=Loa,d- 

 stone, q.v. N. philosophy, v. Physics. N. 

 projection, v. Projection. N. selection: the 

 term used by Darwin to express the survival 

 of those animals best fitted to live under any 

 given set of conditions=The "survival of 

 the fittest" of Herbert Spencer. 

 Nature-printing. A process by which figures 

 of plants, lace, &c., are reproduced upon 

 paper from impressions made upon plates of 

 metal from the objects being pressed closely 

 upon. them. 



Naucrates, (naw'kra-tez). A fish of the 

 mackerel kind. N. dwtor=Pilot-fish. 



Naumannite, (naw'ma-mt). [Prof. Naumann.] 

 A black mineral, chiefly native sulphide or 

 selenide of silver. 



Naupliiform, ( naw'pli-i-form~,). [Nauplius, 

 q.v.] Having the form of a Nauplius, q.v. 



Nauplius, (naw'pli-us). L. nauplius, a mol- 

 luscous animaL] An unsegmented ovate 

 larva: the early stage of a crustacean; after- 

 wards becomes a zoea, q.v. 



Nautical, (naw'ti-kal). [L. nauticus, relating 

 to a sailor). N. almanack, contains data for 

 navigation of ships, &c. : is issued four years 

 in advance. N. day: from midnight to mid- 

 night. 



Nautilus, (naw'ti-lus). [The Latin name.] 

 A marine cephalopod, be- 

 longing to Tetra-braii- 

 chiata. Paper N. = Ar- 

 gonauta : the shell is 

 secreted by the foot, and 

 found only in the female. 

 Pearly N. = Nautilus pom- 

 pilius : having a shell se- 

 creted by the body. 



Nautilidse, ( naw-til'i-de ). 

 [Nautilus, q.v.; Gk. eidos, Nautilus. 

 form.] A family of molluscous animals, be- 

 longing to Cephalopoda. 



Nave, (nav). [Nafu, the A.-S. word.] The 

 portion of a church between the western 

 doorway and the transept or choir. 



Navel-wort, (na'vel-wurt). Cotyledon : an 

 herb belonging to Crassulacese. 



Naviculare, (na-vik-u-la're). [L. navicula, a 

 little skiff.] A bone in the foot, articulating 

 with the astragalus. 



Navigation, (nav-i-ga'shun). (L. navis, ship; 

 ago, I direct.] The art of guiding the coiirse 

 of a ship. Celo-N.=13. with reference to 

 sun, stars, &c. G r eo-JT.=Coasting=:N. with 

 reference to land. 



Naya=Naja, q.v. 



Neanderthal, (ne-an'der-tal). N. skull: a fossil 

 human skull, found at N., near Dusseldorf, 

 8 inches long, 5 wide, with low forehead, 

 intermediate between the European and 

 chimpanzee types. 



Neap-tides, (nep). [A.-S. neafte, scarcity.] 

 Low tides: when sun and moon are in 

 opposition, cf. Spring-tides. 



Nebalia, (ne-bu'li-a). The only marine genus 

 of Phyllopoda, q.v.; the larvae have zoea 

 stages and are also naupliiform. 



Nebulae. Of two kinds: 1. Resolvable into 

 stars by telescopic power. 2. Probably not 

 clusters of stars, but luminous gaseous 

 matter. Chief N.: in Orion, Argo Navis, 

 Perseus, Andromeda, &c. 



Nebulous stars. Stars having nebula? sur- 

 rounding them, as i Orionis and others. 



Necronite, (nek'ro-nit). A variety of Ortho- 



clase. 

 Necrophaga, (nek-rof a-ga). [Gk. nelcros, dead ; 



phago, I eat. ] Carrion-eaters: a general term 



for any animals which devour carrion, used 



especially as=Clavicornes, a sub-division of 



Coleoptera. 



