254 GLOSSARY. 



Ovary, a name in botany given to the outer covering of the 



germ. 

 Ovules, little eggs, the rudiments of seeds which the germ 



contains before its fertilization. 

 Orbicular, round, circular. 



Organography, a description of the organs of plants. 

 Organic, composed of various parts or organs which perform 



separate offices. 



Oxidize, to become rusty or combine with oxygen. 

 Observatory, a place or building for making observations on 



the heavenly bodies. 



Opake, not transparent, not pervious to rays of light 

 Optical, pertaining the eye, to vision, or the science of optics. 

 Orbit, in astronomy, the path of a comet or planet. 

 Outcrop, the naked ends of strata of rock which protrude 



above the surface of the earth, as on the side of a hill. 

 Oolite, a limestone composed of rounded particles like the eggs 



of fish. 



Organic remains, the fossil remains of plants and animals. 

 Olivme, an olive colored simple mineral often found in grains 



and crystals in basalt and lava, 



Oxide, a chemical compound of metals with oxygen, &c. 

 Oxygen, a gas. 



Oxalute, a salt composed of oxalic acid and a base. 

 Oxalic acid, an acid obtained from sorrel. 

 Ordure, excrement, faeces, manure. 



Permeate, to penetrate or pass through the pores of a body. 

 Phospkuretted Hydrogen, a compound of phosphorus and hy- 

 drogen. 



Poudrette, a manure prepared from ordure. 

 Philosopher's stone, an imaginary mineral sought by the alchy- 



mists, which was supposed to be capable by mixture with 

 the baser metals of transmuting them into gold. 

 Proximate, near; "proximate elements," those elements of 



