116 



GLOSSARY. 



aids in forming the canal that pro- 

 tects the spinal cord. 



Neurilem'ma (Gr. vevpov, neuron, a 

 nerve ; \e/j.fj.a, lemma, a peel or 

 skin). The sheath of a nerve. 



Neurine (Grr. vfvpov, neuron, a 

 nerve). Nervous substance. 



Neurol'ogy (Gfr. vevpov, neuron, a 

 nerve ; \oyos, logos, discourse). 

 A description of the nerves. 



Neuro'ma (Gr. vevpov, neuron, a 

 nerve). A swelling or tumour in 

 the course of a nerve. 



Neurop'athy (Gr. vevpov, neuron, a 

 nerve; traOos, path'os,. suffering). 

 Disease of a nerve. 



Neurop'tera (Gr. vevpov, neuron, 

 a nerve ; irrepou, pier 1 on, a wing). 

 An order of insects with four mem- 

 branous transparent wings, with a 

 net-work of veins or nervures ; as 

 the dragon-fly. 



Neuro'ses (Gr. vevpov, neuron, a 

 nerve). A term appled to nervous 

 affections or diseases. 



Neuroskel'eton (Gr. vevpov, neuron, 

 a nerve ; crKcXerov, skel'etori). The 

 deep-seated bones of the vertebral 

 skeleton which have relation to the 

 nervous system and to locomotion. 



Neutral (Lat. ne, not ; uter, which 

 of the two). In chemistry, applied 

 to salts composed of an acid and 

 a base in such proportions that they 

 exactly destroy each other's proper- 

 ties ; in botany, applied to flowers 

 having neither stamens nor pistils. 



Neutralisa'tion (Lat. neuter, neither). 

 In chemistry, the process by which 

 an acid is combined with a base in 

 such proportion as to render inert 

 the properties of both. 



Neu'tralise (Lat. neuter, neither). 

 To render neutral or inert ; to de- 

 stroy the- properties of a body by 

 combining with it another body of 

 different properties. 



Nic'otin (Nicotia'na, the tobacco 

 plant). A principle obtained from 

 tobacco. 



Nic'titate (Lat. nic'tito, I wink). To 

 wink. 



Nic'titating- Membrane. A fold of 

 skin with which birds cover their 

 eyes. 



Nidamen'tal (Lat. nidamen'tum, the 

 material of which birds make their 

 nests). Relating to the protection 



of the egg and young ; secreting 

 material for constructing nests. 



Nilom'eter (Gr. Nei\os, Neilos, the 

 Nile ; /j-erpov, met' r on, a measure). 

 An instrument for measuring the 

 rise of the waters of the Nile. 



Ni'trate (Nitric). A salt consisting 

 of nitric acid with a base. 



Ni'tric (Nitre). Produced from nitre 

 or saltpetre ; applied to an acid 

 obtained from nitre or nitrate of 

 potash. 



Ni'trite. A salt consisting of nitrous 

 acid and a base. 



Ni'trogen (Nitre; Gr. yewou, gen- 

 no! d, I produce). An elementary 

 gas, without colour, taste, or 

 smell, forming the larger portion 

 (79 in 100) of the atmospheric air. 



Nitrog'enised (Ni'trogen). Contain- 

 ing nitrogen. 



Nitrogenous (Ni'trogen). Contain- 

 ing nitrogen. 



Ni'trous (Nitre). Pertaining to nitre ; 

 applied to an acid containing less 

 oxygen than nitric acid. 



Nodal (Lat. nodus, a knot). Relating 

 to a knot ; applied to the points 

 and lines at which the vibrations 

 of a body become arrested, and 

 which assume various regular 

 forms. 



Node (Lat. nodus, a knot). A small 

 oval figure made by the intersection 

 of one branch of a curve with ano- 

 ther ; in astronomy, the point at 

 which ihe moon or a planet crosses 

 the ecliptic ; in botany, the point 

 in a stem from which a leaf-bud 

 proceeds. 



Nodo'se (Lat. nodus, a knot). Knotty. 



Nod'ule (Lat. nodus, a knot ; ule, 

 denoting smallness). A little knot ; 

 an irregular concretion of rocky 

 matter round a central nucleus. 



Nomad'ic (Gr. vo,uoy, nom'os, a pas- 

 ture). Wandering ; subsisting on 

 cattle, and wandering for the sake 

 of pasture. 



No'menclature (Lat. nomen, a name ; 

 calo, from Gr. /caAew, haled, I call). 

 The collection of names peculiar to 



