1 



XGAI CAMPHOR 



871 



NIGHT 



colored in triangular areas with the colors of the 



irum. On being rapidly revolved it appears white. 



N.'s Law. See Law. N.'s Metal, a term for Bis- 



':. N.'s Theory, the Emission theory of light. See 



Ngai Camphor. A camphor, C l0 H 18 O, derived from 

 :ea balsamifera, a tree of S. E. Asia. 



Niata ni-a'-tah) [deriv. obscure]. A breed of small 

 " bull-dog " oxen, produced by a sudden variation, 

 in South America, between the sixteenth and eigh- 

 teenth centuries. 



Niatism (iw v '-at-izm) [niata, a breed of bull-dog 

 "oxen"]. In biology, a form of sudden variation 

 characterized by dwarfing, at times occurring among 

 animals. 



Nibble (nib'-l) [LG., nibbeln, to nibble]. To gnaw; 

 to eat in small bits. 



Nickel ink' -el) [G., niche.', nickel]. Xi — 58; quan- 

 tivalence II, iv. A metal of silver- white luster, resem- 

 bling iron in physical properties. In 1889 it was 

 rted by Krauss, of Munich, to be a compound 

 body. It is much used for plating metallic surgical 

 appliances. See Elements, Table of. N. Bromid, 

 recommended for epilepsy. Dose gr. v-x. N. Chlo- 

 rid, a tonic in anemia. N. Sulphate, has been used 

 as a nerve-tonic in tabes dorsalis. Dose gr. iij-v. 

 All unof. 



Nicking nik'-ing) [origin obscure]. The incising of a 

 horse's tail near the root, to cause it to be carried 

 gher. 



Nickles' Test. See Tests, Table of. 



Nicol nik'-el) [after William Nicol, of Edinburgh]. 

 An abbreviation for Nicol' s prism. 



Nicol's Prism (nih-el) [after William Nicol, of Edin- 

 burgh]. A polished prism of Iceland spar, cut diag- 

 onally across the principal axis, the sections being 

 joined together by means of Canada balsam. It has 

 the property of reflecting the ordinary ray of light out 

 of the field, while the so-called polarized ray is trans- 

 mitted. See Prism. 



Nicomorrhuin {nik-o-mor* '-«-/'«), C. M H M N 4 . One of the 

 alkaloids of cod-liver oil. See Morrhuolins. 



Nicotia ynik-o'-she-ah). Synonym of Nicotin. 



Nicotian ( nih-o / -she-an ) [after Jean Nicot]. I. To- 

 bacco. 2. One who uses tobacco. 3. Pertaining to, 

 or derived from, tobacco. 



Nicotiana {nik-o-she-a' -nah). See Tabacum. 



Nicotianic Acid (nik-o-she-an' -ik). Synonym of Nico- 

 tinic Acid. 



Nicotianin (nik-o'-she-an-in) [after Jean Nicot, a French 

 ambassador to Portugal]. The solid volatile princi- 

 ple to which tobacco owes its flavor. 



Nicotic Acid (nih-of-ik) . Same as Malonic Acid. 



Nicotin [nik f -o-tin) [after Jean Nicot, a French Am- 

 bassador to Portugal], C, H U N,. A poisonous alka- 

 loid found in the leaves of the tobacco-plant ; it may be 

 obtained by distilling the residue from the aqueous 

 extract with lime. It is an oil, readily soluble in 

 water and alcohoL Its odor is very penetrating. It 

 becomes brown on exposure to the air ; its specific 

 gravity at 15 C. is I. on ; it boils at 241 C. 



Nicotinic Acid (nih-o-tin'-ih) [after Jean Nicot], C 6 H 5 - 

 An oxidation-product of nicotin. 



Nicotinism (nik' -o-tin-izni) [after Jean Nicot]. The 

 constitutional effects of the continued or excessive use 

 of tobacco. 



Nicotism [nik'-o-tizm). Synonvm of A Icotinism. 



Nictating \nik-ta'-ling)-[nictare, to wink]. Winking. 



Nictation {nik-ta'-shun). Same as Nictitation. 



Nictitating (nik' -tit-a-ting) [nictitare, to wink]. 

 Winking. N. Membrane. See Membrane. N. 



Nictitation (nih-tit-a'-shun)[nictitare, to wink]. Ab- 

 normal frequency of winking. 



Nidamentum (nid-arn-en'-tum) [nidus, nest]. The 

 decidua ; also any covering of the developing ovum ; 

 an egg-case. 



Nidation (ni-da' '-shun) [nidus, nest]. The develop- 

 ment of an endometrial epithelium in an inter-menstrual 

 period. 



Nidulant (tiid' -u-lanl) [nidulari, to build a nest]. In 

 biology, lying loose in a nest-like receptacle or pulp, 

 like the seeds or sporangia of certain plants. 



Nidularium (nid-u-la'-re-uni) [dim. of nidus, nest]. 

 The mycelium of fungi. 



Nidus (ni'-dus) [L., nest]. I. A central point or focus 

 of infection ; a place in which an organism finds con- 

 ditions suitable for growth and development. 2. A 

 collection of ganglion-cells at the deep origin of a 

 cranial nerve; a nucleus. N. hirundinis, a deep 

 fossa in the cerebellum situated between the velum 

 medullare posterius in front, and the nodulus and 

 uvula behind. • 



Niemeyer's Pill. A pill of quinin, grain 1, digitalis, 

 grain one-half, and opium, grain one-quarter. It is 

 used in pulmonary tuberculosis, and is taken every six 

 hours. 



Niepa (tie' -pah) [E. Ind.]. The bark of Samadera 

 indica, a simarubaceous tree of S. Asia ; it is intensely 

 bitter, and a good tonic. Unof. 



Nigella (ni-jel r -ah) [nigellus, dark]. A ranuncula- 

 ceous genus of plants represented by several species 

 having medicinal properties. N. sativa, fennel-flower, 

 is diaphoretic and emmenagogue. Unof. 



Nigellin (ni-j'el'-in) [nigellus, dark]. A bitter extrac- 

 tive of Nigella sativa. 



Niggl's Test. See Tests, Table of. 



Night (nit) [HE, night, night]. The portion of the 

 day during which the sun is below the horizon. N.- 

 blindness. See Hemeralopia. N. -blooming Ce- 

 reus, the flowers of Cereus grandiflorus, a sedative 

 and diuretic plant, useful in functional ailments of the 

 heart, palpitation and angina pectoris. Dose of the 

 fld. ext. (alcoholic) n\x-xxx. Unof. N. Blue. See 

 Pigments, Conspectus of. N. -cries, a symptom of 

 nervous or physical disorders of children, and especi- 

 ally of the early stage of hip-disease. The child cries 

 out in its sleep from pain produced by reflex spas- 

 modic twitching of the muscles already abnormally 

 irritable. N. Green. See Pigments, Conspectus of 

 N.-mare, a feeling of distress or suffocation during 

 sleep, attended with fright, hideous dreams and often 

 with inability to stimulate muscular contraction except 

 in a very slight degree. N.-pain, a symptom of hip- 

 disease; pain in the hip or knee occurring during 

 muscular relaxation of the limb in sleep. N. -palsy, 

 a nervous manifestation of no especial significance, 

 consisting simply of a feeling of numbness in one or 

 more extremities of the body when the sleeping 

 patient awakes; the so-called "dead fingers." It 

 principally attacks women at the menopause. N.- 

 shade, a popular name for plants of the genus So- 

 lanum, and also the genus Atropa. N. -shade, Bit- 

 tersweet. See Solanum dulcamara. N. -shade, 

 Deadly. See Atropa belladonna. N. -sight. Syno- 

 nym of Nyctalopia. N.-soil, the contents of privy- 

 vaults (often removed in the night). This material is 

 largely employed as manure. N.-soil Fever, a syno- 

 nym of Typhoid Fever. N. -starting, a jerking of the 

 lower extremity occurring at night in children with 

 hip-disease. N. -sweat, the profuse nocturnal sweat- 

 ing often observed in pulmonary tuberculosis and other 

 wasting disorders. N. -terrors, Pavor noctumus ; 

 constematio ; a sudden terror that attacks young 



