GLOSSARY. 253 



Mirage, an optical illusion described in meteorology. 

 Mineral, in common language, the metals and rocks. 

 Metalloid, a name applied to some of the metallic bases of the 



earths. 

 Mica, a rock which is divided or laminated in its shining scales, 



and of various colors. 

 Metamorphic, rocks which have been altered by the action of 



fire. 

 Muriate of magnesia,, & salt formed by the union of magnesia 



with muriatic or hydrochloric acid. 

 Mammalia, vertebrated animals, which have warm blood, 



breathe by means of lungs, bring forth living young and 



nourish them by milk. 

 Membrane, a thin delicate skin. 

 Midrib, the main or middle rib of a leaf, running from the base 



to the point 



Medullary, pertaining to the pith or marrow. 

 Morphology, that part of botany which treats of the formation 



and metamorphosis of organs. 

 Malleable, a metal which can be hammered and drawn out 



into various forms by the hammer, as iron. 

 Nutrient, nourishing, or pertaining to nutrition. 

 Noxious, hurtful, injurious, unwholesome. 

 Nomenclature, a system of naming or applying technical terms 



in any art or science. 

 Nutrition, the act or process of supplying the proper matter 



for the growth of animals and plants. 

 Nitric acid, aquafortis. 

 Nitrate of potash, salt petre. 

 Node, a knot or protuberance. 

 Nocturnal, nightly, occurring every night 

 Nickel, a grayish white brittle metal. 

 Nodular, having nodes or knots. 

 Napiform, resembling a turnip in form, 



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