4 C, EARTirq UAKES. -EG Gfi.— ELECTRICITY. 



EARTHQUAKES. 



Seismorogy (Gr. seismos, an earthquake, and logos, a discourse). 

 — A science constructed from the study of earthquake phe- 

 nomena. 



Seismom'eter (Gr. sehmos, and metron, a measure). — An 

 instrument for measurvig the shock of earthquakes and 

 other violent concussions. 



EGGS. 



Ool'ogy (Gr. oon, an egg, and logos, a discourse). — The science 

 of eggs in relation to their coloring, size, shape, and num- 

 ber, and the law deduced from that knowledge. 



ELECTRICITY. 



Electrol'ogy (Gr. elektron, amber, and logos, a discourse). — 

 That department of physical science which treats of 

 electricity. 



Absorption. — The process or act by which electricity is made 

 passively to disappear in some other substance through 

 molecular or other invisible means. 



An'ode.— In electro-chemistry , the way by which the electric 

 current enters substances through which it passes, or the 

 surface at which the electric current enters the electrolyte ; 

 opposed to cathode, and equivalent to positive pole. 



Cath'ode. — The way by which the electric current leaves sub- 

 stances through which it passes, or the surface at which 

 the electric current passes out of the electrolyte ; opposed 

 to anode, and equivalent to negative pole. 



Ca'tion. — An electro-positiv^e substance, which, in electrolysis, 

 passes to the cathode of the electrolyte. 



Charge. — A quantity of electrical fluid communicated to a 

 coated jar, vial, or pane of glass. 



Conduct'or. — A substance which forms a medium for the trans- 

 mission of some other substance or fluid, particularly of 

 lieat or electricity. 



Declinom'eter. — An instrument for measuring the declinatioo 

 of the majiuetic needle. 



